Home
health care
News: Editors
Physical Therapy Helps Paralyzed Dog Recover

Golden Retriever Rocky 3 was hit by a car and sustained a major spinal cord injury, that virtually paralyzed him. Watch how Karen Atlas, MPT, CCRT and her team at HydroPaws in Santa Barbara performed amazing rehabilitation physical therapy on him. Karen also serves as the president of the California Association of Animal Physical Therapists. This is a coalition of animal physical rehabilitation professionals (licensed physical therapists with advanced training/certification in animal rehabilitation) who seek to play a leading role in defining appropriate legislative/regulatory language in California; similar to those states (such as Colorado, Nevada, and Nebraska) who have already successfully regulated this area of animal care. Even now, the California Veterinary Medical Board wants to limit/restrict our access to qualified non-vet rehab therapists and this video is proof of why this coalition disagrees. This inspirational video of Rocky 3 certainly does demonstrate the important work that is performed by these highly skilled professionals.

Wellness: Health Care
Preventing Heat Stroke
“Sunny and 70” can mean “sunny and deadly”

We have been experiencing idyllic temperatures in Berkeley, Calif., these past couple of weeks—mostly sunny days and mid-70s bliss. Perfect weather for a fun-filled outing with our pets, right? For the most part, the answer is “yes” but these are the kind of days where we have to be extra cautious with our pets. At the veterinary hospital where I practice, I have had three dogs die from heat stoke in the past three weeks. These were not dogs left in unattended cars or as the result of negligent owners. They were really the result of not realizing that “sunny and 70” can mean “sunny and deadly.”

Two of the deaths were Bulldogs, one who played ball for a short 20 minutes outside and the other who went on his “normal daily walk.” The other loss was a Golden Retriever; the owner let him play at the park for an hour with the neighborhood kids, who always loved to spend time with him, such heartbreaking loss for everyone involved.

Many people are unaware of how dogs process heat and how easily they can succumb to heat stroke. Dogs cannot tolerate high temperatures as well as humans because they depend upon rapid breathing (panting) to exchange their warm body air for cooler environmental air. Therefore, when the air temperature is close to body temperature, cooling by rapid breathing is no longer an efficient process, and dogs can succumb to heat stroke in a relatively short time period.

Heatstroke can occur in many conditions that include:

  • Leaving your pet in the car with “the windows cracked.” We all still see this despite the warnings. Here’s the math: When left in a car on a relatively cool 75-degree day, the temperature within a vehicle can increase an average of 40 degrees Fahrenheit within one hour. That equates to 115 degrees in the car, whether the windows are “cracked” or not.
  • When an animal is left outdoors in hot, humid conditions without adequate shade.
  • When an animal is exercised in hot or humid weather: I have treated pets that have developed heat stroke while out for a routine walk, such as the Bulldog. One contributing factor is the fact that short-legged dogs are closer to the pavement, which radiates additional heat, contributing to the development of heat stress or stroke.
  • Other predisposing factors that increase the risk of heat stroke include obesity and being a brachycephalic (short-nosed) breed such as a Pekingese, Pug, Lhasa Apso, Boston Terrier or Bulldog. These dogs suffer from ineffectual panter syndrome, which basically means that their elongated palate in a short face interferes with their ability to pant and can be fatal.

Clinical signs of developing heat stroke:

Heat stroke is an emergency that requires immediate recognition and prompt treatment. A dog’s normal body temperature is 101.5 degrees plus or minus 1 degree Fahrenheit, and any time the body temperature is higher than 105 degrees, a truly life-threatening emergency exists. Initially the pet appears distressed, and will pant excessively and become restless. As the hyperthermia progresses, the pet may drool large amounts of saliva from the nose and/or mouth. The pet may become unsteady on his feet. You may notice the gums turning blue/purple or bright red, which is due to inadequate oxygen.

Severe hyperthermia is a disease that affects nearly every system in the body. Simply lowering the body temperature fails to address the potentially catastrophic events that often accompany this disorder. A pet suffering from hyperthermia should be seen by a veterinarian as soon as possible for appropriate care. There are many life-threatening after affects that happen to a pet’s body following an episode of heat stroke, and early treatment will give your pet the best chance for survival.

What to do:

  • Move your pet to shaded and cool environment, and direct a fan on him or her.
  • If possible, determine rectal temperature and record it.
  • Begin to cool the body by placing cool, wet towels over the back of the neck, in the armpits and in the groin region. You should also wet the earflaps and paws with cool water. Directing a fan on these wetted areas will help to speed evaporative cooling.
  • Transport to the closest veterinary facility immediately.

What NOT to do:

  • Do not use cold water or ice for cooling!
  • Do not overcool the pet; most pets with hyperthermia have body temperatures greater than 105 degrees, and a reasonable goal of cooling is to reduce your pet’s body temperature to between 102.5 and 103 degrees Fahrenheit while transporting him or her to the closest veterinary facility.
  • Do not attempt to force water into your pet’s mouth, but you may have fresh cool water ready to offer should your pet be alert and show an interest in drinking.
  • Do not leave your pet unattended for any length of time.
  • Rapidly cooling the pet is extremely important. While ice or cold water may seem logical, its use is not advised. Cooling of the innermost structures of the body will actually be delayed, as ice or cold water will cause superficial blood vessels to shrink (vasoconstrict), effectively forming an insulating layer of tissue to hold the heat inside. Tap water is more suitable for effective cooling.

What if I see a pet in distress?

California law now prohibits leaving pets unattended in a vehicle, but I still see this (“grrrrrr”) all of the time. If you do happen see a pet in distress, you can call the local animal control agency, police or 911 for assistance. Any peace officer, humane officer or animal control officer is authorized to take all steps necessary for the removal of an animal from a motor vehicle. I have also made a downloadable flyer for you to print and leave on car windshields if you notice a pet inside of a vehicle. I wanted to create way to educate others instead of just getting worried, upset and frustrated. I know it is just a small gesture, but if it can save one pet’s life, then I’ve done my job with it.

I hope this blog has offered both awareness and education and please feel free to leave questions or comments!

Wellness: Health Care
Canine Seizures
Out of the blue, your dog rolls on his side and starts to shake. What’s going on?

Charlie, a four-year-old Shih Tzu mix, held his head low and cried out when touched. His regular veterinarian performed blood tests and took X-rays, none of which revealed a reason for the neck pain. After discussing possible causes—a slipped disk and meningitis among them—the vet prescribed a trial of antibiotics and pain medication. At first, Charlie improved, but within a few days, his pain seemed to increase. Then he had a seizure.

His people rushed him to a local emergency clinic, where he was admitted. The clinic kept Charlie overnight to stabilize him, and the next day, transferred him to our practice, Southeast Veterinary Neurology in Miami, Fla.

Charlie was minimally responsive. When we examined him, we saw that he tended to turn his head to the left and didn’t react to stimuli on the right side of his body; he didn’t blink when touched near the right eye or when his right eye was approached. After a magnetic resonance imaging (MRI) and spinal fluid analysis, we had a diagnosis: encephalitis. Treatment was started immediately.

Seizures—a manifestation of uncontrolled electrical activity in the cerebral cortex—are the most common canine neurological disorder. The cerebral cortex is made up of cells (neurons) that communicate with each other via electrical activity. A seizure happens when that electrical activity becomes excessive or uncontrolled.

Seizures are classified as either focal or generalized, with the latter being the most frequently seen. In a classic generalized seizure, all four legs become stiff and the dog lies down or falls over before losing consciousness and convulsing. During a convulsion, many dogs will vocalize and salivate; some will urinate or defecate. The seizure may last anywhere from a few seconds to several minutes, or longer.* Focal seizures are milder and only affect one part of the body—part of the face, or one leg.

Any disturbance that either increases the electrical activity in the brain or decreases the control mechanisms that prevent seizures can cause these episodes. There are three basic types of disturbances: extracranial (problems outside of the brain that secondarily affect the brain), intracranial (physical or structural problems with the brain itself) and idiopathic epilepsy.

Low blood sugar, severe liver or kidney disease, electrolyte abnormalities such as low calcium, and toxins/poisons are among the causes of extracranial seizures. All of these conditions are relatively easy to identify with blood and urine tests.

Intracranial causes include brain tumors, strokes, encephalitis/ meningitis (as in Charlie’s case), head injury or a malformation such as hydrocephalus (“water on the brain”). Diagnosing these conditions requires an evaluation by a neurologist, an MRI of the brain, and possibly a cerebrospinal f luid analysis. Seizures experienced by certain breeds of dogs—including Boxers, Yorkshire Terriers, Maltese and other terriers—are more likely to have an intracranial cause.

Idiopathic epilepsy—seizures with no known cause—is the most common reason for recurrent seizures, and is the result of an inherent hyperexcitability of the neurons of the cerebral cortex. In general, dogs with idiopathic epilepsy are between one and five years of age when they have their first seizure, which is usually of the generalized type. In between seizures, they’re completely normal, as are their neurological examinations.

Seeing your dog have a seizure can be distressing, but the primary thing you need to do is to remain calm. Do not put your hands near your dog’s mouth, as in the throes of a seizure, he’s not aware of his actions and may unintentionally bite you. Keep your dog in a safe area where he is unlikely to hurt himself, moving him away from stairs, pools or other hazards. If this is your dog’s first seizure, take him to your veterinarian immediately.

Your vet will likely start with a series of blood and urine tests to evaluate the liver, kidneys, electrolytes and other internal organs, looking for an extracranial cause. A consultation with a veterinary neurologist and an MRI may be recommended if the blood tests are normal, if your dog is younger than one or older than six, or if he acts abnormally between seizures.

Diazepam (Valium) or midazolam, fast-acting drugs, will halt a seizure in progress. Depending on the cause and the dog’s response to treatment, longer-acting anti-seizure medications are also prescribed. Among these are phenobarbital, potassium bromide, levetiracetam (Keppra), zonisamide (Zonegran) and felbamate (Felbatol); each has both positive and potentially adverse effects. Your veterinarian or neurologist will discuss which medication makes the most sense for your dog. For many conditions, including idiopathic epilepsy, medication can help reduce the frequency and severity of seizures, but some seizure activity can still be expected.

Seizures are indeed scary, but understanding their causes and knowing what to do when they occur go a long way toward successfully coping with them.

*Ed. note: According to other sources, a seizure that lasts more than five minutes or that reoccurs three times in a 24-hour period should be considered an emergency.

Wellness: Healthy Living
Six Tips on Caring for Older Dogs
We look at ways to make their lives easier.

In your eyes, your dog will alway s be a puppy, even if she’s getting up there in canine (and human) years, or her muzzle is beginning to gray. However, eventually the day will come when you notice that your pup is panting a little bit harder after a long walk and struggling to climb onto your bed. It’s time to start adjusting to the lifestyle needs of an older dog.

When a dog is considered a senior largely depends on breed. Smaller dogs (such as Chihuahuas or Terriers) don’t reach their golden years until they’re 10 or 12, while a Great Dane may attain senior status at the age of five or six. Beyond size and breed, genetics, diet and environment all have an impact on a dog’s life expectancy.

Just as modern medicine has extended the lives of people, with the right combination of attention and preventive care, it can also extend the lives of dogs. If you want your older dog to have a long and happy life, consider incorporating these strategies into your pet care routine.

Remember your dog’s teeth. Dental hygiene is particularly crucial as your dog ages. Regular brushing and professional cleaning can prevent painful dental disease and decay (and help your dog avoid the chewing problems mentioned earlier). If your dog doesn’t enjoy having his/her teeth brushed, consider dental treats and toys instead.

Watch your dog’s diet. Mature dogs often have food issues, including problems chewing, lack of appetite, obesity and digestive difficulties. Consult with your vet on the best diet and exercise plan for your aging dog. Dietary changes may include adding more fiber to aid with digestion or decreasing carbohydrates to maintain optimal weight. Supplements such as fish oil or glucosamine can be added to alleviate joint pain.

Exercise your dog’s body and mind. Like people, aging dogs experience pain and have difficulty performing physical activities they used to enjoy. However, exercise continues to be imperative to their health and well being. Take your dog on short, gentle walks and monitor his/her breathing and gait to make sure nothing is amiss. Your dog’s brain needs plenty of exercise as well. Stimulating toys such as food puzzles help keep your dog sharp.

See the vet more often. Take your dog in for a vet checkup at least twice a year. Just as elderly people need to be aware of health issues and visit their doctors more often, aging pets benefit from more frequent visits. Older pets may need additional blood tests, dental care and examinations. Additionally, many breeds have predispositions toward certain ailments, including arthritis, hip dysplasia, cancer and diabetes. Early detection can help catch these before they become major problems.

“Seniorize” your house. Just as you once puppy-proofed your home, you now need to provide your older dog with special accommodations. For dogs with hip dysplasia or joint issues, consider a special ramp or stairs so they can still get in the car or join you on the bed. Keep food and water in areas they can easily reach, especially if they are vision-impaired. Heated beds can soothe achy joints, particularly if you live in a colder climate. Finally, non-slip surfaces will prevent falls and help your older pet maintain traction when rising.

Pay attention. Monitor changes in behavior; appetite; weight loss or gain; dental issues; and any lumps, bumps or lesions and bring them to your vet’s attention. (A journal is a great memory aid.)

Taking care of an older dog may involve a little more work than you’re used to doing, but caring for a lifetime companion is a deeply rewarding experience. Your dog has been good to you (and for you) for years—now’s the time to return the favor!

Wellness: Health Care
Acupuncture Can Help Dogs
Holistic Medicine
Back Problems / Acupuncture

Intervertebral disc disease (IVDD)—what some call a “slipped disc”—can smolder or it can strike full-blown, leaving your dog in excruciating pain and unable to walk. Initially, signs that a dog is afflicted can be subtle: a hesitation about going up or down stairs, paws that knuckle under or cross over, nail scuffing, an arched back, a tense abdomen. Dogs may shy from their food bowls to avoid bending their necks, or cry when picked up.

IVDD causes compression of the spinal cord and leads to weakness, pain and sometimes paralysis, and is divided into two categories: Hansen Type I and II. Type I often swoops in suddenly, usually in younger, smaller dogs ages three to six. The center jelly of the vertebral disc, called the nucleus pulposus, degenerates, then ruptures and presses on the spinal cord. Not surprisingly, the chondrodystrophic breeds (dogs with short legs and longbacks)—Dachshunds, Corgis, Lhasa Apsos, Shih Tzus and Beagles—are predisposed to this type.

Type II, which is typically seen in large dogs like German Shepherds, Labradors and Dobermans ages eight to ten, progresses more slowly. Though the disc doesn’t burst its center, it bulges between the vertebrae and impinges on the spinal cord, causing chronic pain and weakness.

To rule out fractures, bone infections and cancers, your vet will start with X-rays, but a contrast myelogram, CT or MRI (all of which are often done at specialty centers) is needed to visualize the spinal cord and determine the nature and location of the problem.

In addition to type, IVDD is described by level of severity. Roughly, grade I involves pain; grade II, unsteadiness; grade III, weakness that prevents standing or walking; grade IV, paralysis but able to feel deep pain when the toes are pinched; and grade V, complete paralysis with loss of deep pain.

Dogs with grades 1 through IV will likely be managed with pain meds, muscle relaxants and strict rest for up to a month, and are often referred for physical therapy or Class IV laser treatments. Depending on the duration of neurological deficits and amount of pain, surgery may also be recommended for dogs with grades II, III and IV. Because the disease can change quickly, even dogs diagnosed with lower-grade IVDD need sequential exams to ensure that the condition is not progressing.

When a dog is completely unable to walk, decisions have to be made swiftly. Dogs who stay in the grade V stage longer than 48 hours often remain paralyzed despite intervention, while up to 50 percent of those who have surgery in the first 24 hours may regain their ability to walk.

IVDD surgery removes compromised discs, hemorrhage and adjacent bone compressing the spinal cord. With severe disease, it’s the best chance for a dog to walk again. It does, of course, also entail expenses and risks that not everyone is able or willing to undertake. What other options do we have?

Thankfully, veterinarians have been studying other modalities to treat IVDD, acupuncture among them. In 2007, a team lead by A.M. Hayashi found that dogs of all IVDD grades recovered more quickly with electroacupuncture (EAP) combined with a standard Western medical approach than Western treatment alone (JAVMA 231[6]: 913–918).

In 2009, A. Laim et al. reported that dogs receiving EAP and pain medications after surgery for acute IVDD were less likely to need higher doses of pain meds during the first 12 hours than those who received meds alone. These patients also had significantly lower pain scores 36 hours after treatment (JAVMA 234[9]: 1141–1146).

A 2010 study compared three options for IVDD dogs with severe neurologic deficits of greater than 48 hours’ duration: decompressive surgery (DSX), EAP, and DSX followed by EAP (DSX + EAP). The study, led by J.G.F. Joaquim, showed that EAP was more effective than DSX + EAP, and that DSX alone was the least successful. These dogs had severe, long-standing IVDD in the thoracic and lumbar (thoracolumbar) spine, and in the past, their prognosis would have been dismal. (JAVMA 236[11]: 1225–1229).

How does acupuncture work? While there is some debate over definitions, it’s generally accepted that acupuncture points (acupoints) concentrate clusters of free nerve endings, small blood and lymphatic vessels, and mast cells, part of the immune system. A veterinarian certified in acupuncture inserts small, sterile needles into specific points to stimulate muscles, nerves, circulation and the immune system. For IVDD, one needle may be placed at the top of the spine by the shoulders, and a second above the pelvis, which moves the qi and stagnated energy caused by the disc disease.

Functional MRIs reveal that acupuncture activates pain-associated brain stem regions. The specific mechanism of acupuncture on IVDD has not yet been fully explained, but it’s surmised that it reduces local swelling, inflammation and pain; decreases cord compression, scar formation and tissue oxygen deprivation; and restores damaged nerves.

When compared to the use of needles alone, EAP has been found to increase the body’s response to acupuncture. In EAP, needles in the skin are connected by metal clips; electro-impulses move between the clips and into the needles, producing sensations that range from a tingling to a vibration. Frequency and intensity are determined by the type of condition being treated. Sessions usually last from 10 to 30 minutes, and dogs often fall asleep during treatment.

EAP has a cumulative effect and is typically prescribed as a series of treatments, every one to two weeks for at least a few months. Appropriate Chinese herbal formulas are often prescribed at the same time to reduce pain and enhance the effects of acupuncture. Dogs then proceed to maintenance acupuncture at one- to three-month intervals to prevent recurrence.

Ideally, your dog will never go through the pain of IVDD, and you won’t have the worry. But if you do find yourself up against a down dog, it’s good to know that adding acupuncture to the treatment repertoire may help your friend get back on all fours.

Wellness: Healthy Living
Exploring the Humane and Canine Microbiome
Q&A with Dr. Robynne Chutkan

Dr. Robynne Chutkan, one of the leading gastroenterologists in the country, is the author of a new book, The Microbiome Solution, in which she takes us on an exploration of our guts’ ecosystems. Her rousing endorsement of “living dirty” includes the benefits of living with dogs. Bark’s editor speaks with her about just how helpful dogs are to our health, inside and out.

Is it true that there are similarities between our microbiome and those of our dogs, and that dog-owning families have more diverse microbial colonies than dogless households?

Although we share many of the same microbes, dogs in general have a more diverse microbiome than we do. Not surprisingly, some of their additional species are soil microbes (rolling in the dirt from time to time may be a habit worth copying!). Close contact with our dogs is hard to avoid, and that’s a good thing, because they end up passing on some of their unique microbes to their owners, giving dog-owning households a microbial boost.

Dog owners who have children share more mouth bacteria with their dogs than they do with their children. Is this a good thing?

The microbiome in children under the age of three is still developing and as a result, is very different from that of an adult, although there are still lots of shared species with household members (and pets), given the proclivity children have for [putting] everything in their mouths. So, most adults (not just dog owners) have a very different microbiome from their young children. As children get older, their microbiome starts to more closely resemble that of the other household members—not just parents, but pets, too. The vast majority of microbes our canines pass on to us are helpful or benign, not harmful, so keep those doggie kisses going.

So bacteria aren’t species-specific? Is that why, as you note, owning a dog is a highly effective way to replenish and revive bacteria that are basically under attack by modern-day living?

Some bacteria are species-specific, but many are shared by both humans and dogs. Most dogs are much more in touch with the natural world than their owners are, and that’s exactly where lots of the health-promoting microbes come from: soil; unfiltered, unchlorinated water; and, of course, the poo of other animals that our dogs are constantly checking out. Dogs tend to go easy on the hand sanitizer and antibiotics and eat a less processed diet (all habits worth emulating), so they haven’t super-sanitized away as many of their microbes as we have. Some of these canine microbes can be passed on to us, helping to replenish our lackluster microbiome.

The high-fat, low-fiber food we eat, attracts a different range of microbial types; do you know if that is the same for dogs?

I’m not aware of any specific studies looking at variations in canine diets and the effects on their microbiome, but certainly, dogs who eat more processed grains and other foods not natural to their diet tend to have more health problems, and the same is true for humans.

You mention that it’s okay to be a little dirty and sweaty. Why do you think Americans are so obsessed with being hyper-clean?

In the pre-antibiotic era, epidemics of the plague, cholera and other highly infectious diseases wiped out vast numbers of people. The advent of penicillin in the 1930s is still one of the most important contributions to modern medicine, and antibiotics have saved countless lives. But now the pendulum has swung the other way; we’re currently in an era of overdiagnosis and over-treatment, and we’re seeing the emergence of new “modern plagues,” not from infection, but from not enough microbes.

However, the public still sees antibiotics as the life-saving miracle workers they were in the first part of the last century, not as the overprescribed menace they’re becoming. Plus, 80 percent of all antibiotics sold in the U.S. are used in the livestock industry, mostly to fatten animals for slaughter. Clearly, that’s not a lifesaving endeavor.

I think the pharmaceutical and personal-product companies also have a lot to do with it. They’re responsible for many of the public-health campaigns that incorrectly equate cleanliness with health, and of course, they make billions of dollars selling hand sanitizer and other anti-bacterial products.

It’s not just okay to be a little sweaty and dirty, it’s great for your microbiome and your overall health. We need exposure to dirt and germs (bacteria, fungi, protozoa and so forth) to train our immune systems to recognize friend from foe. Not enough exposure to germs, especially when we’re young, leads to a confused immune system that tends to overreact. The result is allergies and autoimmune diseases.

In defense of less bathing and shampooing: your body is really good at concocting the exact formula needed to keep your skin and hair moisturized and healthy. But what do we do? We scrub away our natural oils with harmful antibacterial products and then try to revive our skin and hair with store-bought products full of chemicals. Live dirty for a healthier— and better looking—you!

Many studies have shown the benefits to children of having a dog, including a decrease in eczema and asthma. Why else would you recommend that a family get a dog?

Having a dog is great for reducing stress and anxiety and lowering blood pressure. And we already know they improve the microbiome of the entire household.

What’s your personal dog “biome”?

My mother’s bridge partner, Eva, worked for the Swedish embassy, and when she moved back to Sweden, she left her beloved German Shepherd, Trygg, with us. He’d been used to spending all his time with Eva, and became immediately attached to my mom. We had to be super vigilant in the bathroom because he loved to drink from toilets (all kinds of rewilding going on!).

Hugo, our German Shorthaired Pointer puppy, came into our lives about six months ago. Getting a dog forced me to slow down my too-busy lifestyle and spend more time sitting on my front steps, stroking Hugo and literally smelling the roses. He’s super active, so my husband and I take turns running with him in the mornings and evenings.

We live near Rock Creek Park in Washington, DC, so, thanks to Hugo, there’s a whole lot of dirt and sweat happening on a daily basis. Our daughter Sydney loves him so much that we really can’t imagine life without him.

Hugo slobbers over everyone he comes into contact with, and since I frequently have meetings with the Gutbliss team at our house, he’s become our CRO—Chief Rewilding Officer!

Wellness: Healthy Living
Medical Cannabis: Is it good for our dogs?
Medical marijuana shows promise for ailing companion animals.

A Bulldog who spent two years either lying down or throwing up plays like a puppy thanks to a daily dose of medical marijuana. A Boxer’s skin cancer begins to disappear following topical applications of cannabis oil. A 12-year-old Lab mix diagnosed with liver and lung cancer regains his appetite and becomes more himself after his owner gives him a cannabis tincture purchased from a licensed medical marijuana dispensary.

These stories offer hope to those of us who live with aging and/or infirm dogs, hope that we can improve the quality of their lives and perhaps even extend them.

Even more hopeful is the fact that these aren’t isolated incidents, but rather, three in an ever-increasing narrative of companion animals and cannabis- assisted healing. Yet, veterinarians played little to no official role in them. Why? Because Cannabis sativa (aka marijuana, grass, pot, hash, ganja, et al.)— a plant cultivated for literally thousands of years for its seeds, fibers and medicinal value—is a federally designated Schedule 1 controlled substance, a “drug with no currently accepted medical use and a high potential for abuse.”

So, even if vets believe that medical marijuana could or would relieve a dog’s pain, nausea or seizures, their hands are tied, including in the 23 states and the District of Columbia where cannabis is legal for human medical use. Physicians in those states are exempt from prosecution, but veterinarians don’t have the same protection. Prescribing, or even recommending, cannabis for medicinal use exposes them to the loss of their license to practice.

It’s a difficult place for a vet to find him- or herself: to have a remedy that has been shown to have very real benefits but not be able to use it, or even mention it, without career-ending consequences. Nonetheless, some have put their livelihoods at risk by challenging that prohibition, usually for the same reasons given by the late Doug Kramer, DVM, of Chatsworth, Calif., in a 2013 interview with Julia Szabo: compassion, and to prevent owners from accidentally overdosing their animals in well-intentioned efforts to relieve their pain.

And that’s part of the veterinary quandary. Medical marijuana has been described as the new “dot.com” boom, fueled by a growing body of research that seems to be validating cannabis’s beneficial effects for people. When people are helped by a particular treatment, they tend to want to share it with their ailing companion animals.

With medical marijuana, they’re doing this in increasing numbers, acting on the belief that if it works for them, it can also work for their dog or cat … or horse, for that matter. In doing so, they’re not necessarily curing incurable conditions but rather, are helping their animals enjoy daily life with better appetite and less pain until age or disease ultimately catches up.

The Backstory

The plant world has given us some of our oldest and most trusted—and, it’s true, sometimes abused—remedies. Pain relievers like codeine and morphine (poppy); colchicine, an antitumor drug (autumn crocus); the cardiac drug digitalin (purple foxglove); antimalarial quinine (quinine tree); and salicin, the chemical precursor to aspirin (white willow). The list is long.

When that plant has a cultural backstory like marijuana’s, however— “demon weed” in the ’50s, counterculture toke of choice in the ’60s, DEA Schedule 1 drug in the ’70s and onward —empirical evidence is harder to come by. Many barriers are placed in the path of those who want to find answers to questions about marijuana’s potential healing powers. Consequently, there’s a scarcity of rigorous research on the topic, particularly for veterinary application.

Determining whether or not to bring medical marijuana into general and legal use nationwide for humans and animals alike—and how to do it in a way that maximizes its benefits and minimizes its risks—requires this research. Stories, no matter how compelling and promising, are not science, and anecdotal evidence isn’t evidence in the scientific sense. Rather, hypotheses need to be tested in randomized, placebo-controlled studies, the results analyzed and conclusions drawn. The results are then retested and found to be replicable (or not) by others.

Until relatively recently, claims for cannabis’s medicinal values haven’t been supported in this way. As Hampton Sides notes in “High Science,” the June 2015 National Geographic cover story, “for nearly 70 years, the plant went into hiding, and medical research largely stopped … In America, most people expanding knowledge about cannabis were, by definition, criminals.”

The Science

Now for the more technical aspects of the topic, greatly simplified and synthesized.

The first published research related to cannabis and companion animals appeared in 1899 in the British Medical Journal. Written by English physician and pharmacologist Walter E. Dixon, the article included Dixon’s observations on dogs’ response to cannabis. However, it would be almost 100 years before we understood where the response originated: in the endocannabinoid system (ECS).

All vertebrates, from sea squirts to humans, have an endocannabinoid system, which scientists estimate evolved more than 600 million years ago. This ancient system, unknown until the late 20th century, is named for the botanical that most dramatically affects it, Cannabis sativa. Cannabinoids are the ECS’s messengers. The system’s purpose is to maintain internal balance— to “Relax, Eat, Sleep, Forget and Protect.”

Marijuana, a complex botanical with more than 400 known natural compounds, contains at least 64 phytocannabinoids (plant-based cannabinoids). The two produced in greatest abundance are cannabidiol (CBD) and tetrahydrocannabinol (THC).

How do they work? According to the National Cancer Society, cannabinoids “activate specific receptors found throughout the body to produce pharmacologic effects, particularly in the central nervous system and the immune system.” The effects depend on the receptors to which they bind.

Robert J. Silver, DVM and veterinary herbalist of Boulder, Colo., provides another way to look at it. “Receptors are like locks, and cannabinoids are like keys. They fit together perfectly. Once the cannabinoid connects to the receptor and ‘turns that lock,’ a series of actions in the cell membrane occur; these actions are responsible for some of the cannabinoid’s effects.”

In his forthcoming book, Medical Marijuana and Your Pet, Dr. Silver notes that the ECS is unique in the world of neurotransmitters. Instead of releasing signals across a synapse (gap) in a forward direction, “the body’s naturally occurring endocannabinoids travel backward from the post- to the presynaptic nerve cell, inhibiting its ability to fire a signal. This is one way the ECS helps modulate and influence the nervous system.”

Research has revealed two distinct cannabinoid receptors, CB1 and CB2. As in other vertebrates, canine CB1 receptors are primarily found in the brain, but also appear in dogs’ salivary glands and hair follicles, while CB2 receptors are localized in canine skin, immune system, peripheral nervous system and some organs, such as the liver and kidneys.

Of the currently known cannabinoids, only one—THC—provokes a “mind-bending” response. CBD, on the other hand, has several well-documented biological effects, including antianxiety, anticonvulsive, antinausea, anti-inf lammatory and antitumor properties.

Terpenoids, components that give plants their distinctive odors, also play a role, helping cannabis cross the bloodbrain barrier and work synergistically. Ethan B. Russo, MD, associated with GW Pharmaceuticals in the UK, calls this the “entourage effect.” In an article in the British Journal of Pharmacology, Russo notes that terpenoids may make a meaningful contribution to cannabisbased medicinal extracts “with respect to treatment of pain, inf lammation, depression, anxiety, addiction, epilepsy, cancer, fungal and bacterial infections (including methicillin-resistant Staphylococcus aureus [MRSA]).” The entourage effect also suggests that in general, the whole plant, with all of its phytocannabinoids, is likely to be most effective for medicinal purposes.

Those who choose to treat their companion animals with medical marijuana generally give it to them in one of two ways: as an oil or as an edible —a food item made with marijuana or infused with its oil. While edibles intended for human consumption usually contain THC, those for dogs and cats more commonly use CBD from industrial hemp, strains of cannabis cultivated for non-drug use, which has almost no THC.

In 1996, California became the first state in the nation to legalize medical marijuana. It now has the largest legal medical marijuana market in the U.S. —not to mention an almost clichéd historical relationship with the herb— so it’s no surprise that many who are pushing the boundaries of its use with companion animals are based there.

Constance Finley, founder of Constance Pure Botanical Extracts (a Northern California legal medical cannabis collective) became involved in cannabis use with dogs when her 10-year-old service dog was diagnosed with hemangiosarcoma and given six weeks to six months to live.

Finley had been using cannabis oil herself to treat the effects of a debilitating autoimmune disease that began when she was in her mid-40s. The prescription medication she took almost killed her, she says, an experience that inspired her to set aside her long-held bias against marijuana and give it a try. The oil provided both pain- and symptom relief, and Finley went on to study cannabis cultivation and the complicated laws around its use. She eventually developed proprietary blends of highly concentrated oils from multiple strains of cannabis, extracted with organic, food-grade solvents.

So, when her much-loved dog was struggling with cancer, she says she dithered, then began giving the dog small amounts of cannabis oil, wiping it on her gums. Within days, the dog started to move around normally and eat; after three weeks of treatment with the oil, her vet could find no signs of the cancer. Unfortunately, she didn’t completely understand how cannabis worked; she figured her dog was cured and stopped using the oil. Within six months, the cancer was back, and ultimately it claimed her dog’s life.

However, the experience made her a believer in its value for companion animals. While to date, there’s been no dog-specific research on its medical use, Finley is confident that cannabis oil has a place in the veterinary toolbox.

In her work with human clients, Finley says she has yet to see a conflict between conventional medications and cannabis, although anyone using it with dogs needs to be aware of the dog’s entire situation. It’s critically important, she says, that the dose be correctly titrated so the dog’s system isn’t hit with too much THC too quickly. She also notes that the effectiveness of an individual dog’s endocannabinoid system, not the dog’s weight, determines the dose. To establish the correct dose, it’s necessary to work with and observe the dog.

A dosage protocol for dogs is one of the areas in need of study and standardization. In the mid-1970s, researchers found that dogs have a high concentration of CB1 endocannabinoid receptors in their hindbrain and medulla as well as other areas of the brain. This suggests that, in terms of compounds that include THC, dogs require less to get the desired effect. (One of the diagnostic signs of THC overdose is something called “static ataxia,” first described in the 19th century and unique to dogs. Dogs in this condition rock rigidly back and forth and drool, their muscles tense up, and their pupils dilate.) According to Dr. Silver, when it comes to dogs and medical marijuana, “The ratio of brain weight—and by extension, receptors— to body weight is not linear.”

Finley also observes that there are at least two myths about medical marijuana that need to be dispelled. First, that CBD is good and THC is bad; each has its uses, but for cancer in particular, she says, THC is the workhorse. Second, that hemp and cannabis are the same; they are different varieties or sub-species, and while CBD can be refined from hemp, she feels that cannabis provides oil that is more easily used by the body.

In Oakland, Calif., Auntie Dolores has been making cannabis-infused edibles for California’s medical marijuana users since 2008. It recently launched Treatibles, a new, locally manufactured product for dogs and cats. The active ingredients are CBD, CBN (cannabinol) and CBG (cannabigerol) distilled from European industrial hemp, which, founder and CEO Julianna Carella notes, is “non-toxic, 100 percent safe and non-psychoactive. Even dogs who do not have health problems can use the product as a preventive measure.”

Each bag of Treatibles, about 40 pieces, contains 54.6 mg of CBD; each t reat contains about 1 mg. Carella says that the company guarantees 40 mg per bag, but often the consumer gets a bit more. “We feel that all products purporting the health benefits of CBD should have at least enough of the material in the product to warrant the price, as well as to provide a medicinal dose. Even so, dogs are more sensitive to cannabinoids and generally need less than humans.”

Carella says that she was inspired to develop edibles for companion animals by cannabinoid science and research into the endocannabinoid system as it relates to all animals. Like others in the field, she is dismayed by cannabis’s current federal legal status. “Unfortunately, research on cannabinoids and animals is delayed due to the status of cannabis and the Controlled Substance Act, which has disallowed research into its medicinal value. CBD has become part of this controversy, even when derived from hemp.”

Initially, Treatibles was sold only through the company’s Treatibles website, but Auntie Dolores has recently been making it available in California medical cannabis dispensaries and local pet retail outlets. Holistic Hound in Berkeley, Calif., is one of the first stores to carry the product. While its name includes the word “treats,” store owner Heidi Hill considers Treatibles to be more closely aligned with supplements— i.e., to have health benefits. She says her customers have given Treatibles an enthusiastic reception, with most reportedly using the edible to alleviate their dogs’ anxiety and, in some cases, pain.

Hill says she gives Treatibles to Pearl, her aging, arthritic Siberian Husky, and has observed an improvement in her appetite and energy level. The quality of its other ingredients—among them, organic, gluten-free oat flour; pumpkin; peanut butter; organic coconut oil and coconut nectar; organic brown rice flour; applesauce; turmeric; and cinnamon— also recommends it, she says.

Change Is Coming

While many have seen positive outcomes, some veterinary professionals worry about people extrapolating from their own experiences with medical cannabis to their dogs’ health problems and giving dogs inappropriate amounts. “Sometimes public sentiment and activity get ahead of the scientific background, and that can be dangerous,” Barry Kellogg, senior veterinary adviser to the Humane Society of the United States, has said.

To date, the American Veterinary Medical Association has not taken an official position on the use of medical marijuana with animals. The American Holistic VMA is the first, and so far only, veterinary organization to officially encourage research into the safety, dosing and uses of cannabis in animals. In 2014, the group released a statement that said in part, “There is a growing body of veterinary evidence that cannabis can reduce pain and nausea in chronically ill or suffering animals, often without the dulling effects of narcotics. This herb may be able to improve the quality of life for many patients, even in the face of life-threatening illnesses.”

Other developments are on the way. In March of this year, Nevada state senator Tick Segerblom (D-District 3) introduced Senate Bill 372, which makes a variety of changes related to medical marijuana in the state. Among its provisions is one that would allow officials to issue medical marijuana cards to companion animals whose owners are Nevada residents and whose vet is willing to certify that the animal has an illness that might be helped by marijuana (the illness does not need to be fatal).

California is also in the process of creating a structured regulatory system. In the June 4, 2015, edition of the Sacramento Bee, reporter Jeremy White summarized Assembly Bill 266: “[It] would create what’s called a dual-licensure system, with cannabis entrepreneurs needing to secure permits both from local authorities and from one of a few state agencies. The Department of Public Health would oversee testing, the Department of Food and Agriculture would deal with cultivation and the Board of Equalization would handle sales and transportation—all under the auspices of a new Governor’s Office of Marijuana Regulation.”

According to Constance Finley, the fact that the marijuana industry is unregulated has been part of the problem regarding access. But next year may be the tipping point. If California’s AB 266 is passed and the marijuana industry comes out of the shadows into effective regulation, particularly in terms of verifiable cannabinoid content and freedom from contaminants, the rest of the nation could follow. The state’s size, market potential, and trailblazing environmental and technology industries have historically inf luenced trends nationwide, and that dynamic is likely to drive the discussion in this case as well.

Veterinary professionals are generally in agreement that more study is needed. In a 2013 interview with R. Scott Nolen, Dawn Boothe, DVM and director of the Clinical Pharmacology Laboratory at Auburn University’s College of Veterinary Medicine, commented: “Veterinarians do need to be part of the dialogue. I can see a welldesigned, controlled clinical trial looking at the use of marijuana to treat cancer pain in animals. That would be a wonderful translational study, with relevance to both pets and their people.” (In translational research, laboratory science and clinical medicine combine their efforts to develop new treatments and bring them to market.)

Narda G. Robinson, DVM, director of Colorado State University’s Center for Comparative and Integrative Pain Medicine, agrees. In an email exchange, Dr. Robinson said, “There is a big gap that needs to be addressed between those who are already using hemp products and finding value for their animal and science-based practitioners who want to make sure that their patients are receiving safe and effective treatment. Research will help bridge that gap.”

Next Steps

Clearly, veterinarians—our partners in keeping our animals healthy—need a voice in this debate. While interested in the herb’s potential, many are leery about trying it, not only because of the legal consequences but also, because there’s so little evidence-based information. On the other hand, dog owners who have found it useful for themselves feel that not including it in the vet-med repertoire is a missed opportunity.

Although the tide is slowly turning in its favor, the debate about the utility of medical marijuana and its related components for both people and their pets is often mired in personal bias and opinion. Regardless of what position we take, it would seem that the best way to come to a resolution is to focus on the science. Controlled studies that determine cannabis’s therapeutic and toxic ranges in veterinary use and standardization of THC and/or CBD content have the potential to make a potent natural ally legally and safely available to our four-legged companions.

In transforming anecdote to evidence, we can move from what we think, what we believe and what we imagine to what we actually know. That would be a very good thing for us and for our co-pilots as well.

Wellness: Health Care
Large-Scale Cancer Study of Golden Retrievers Holds Hope For All Dogs
On the trail of canine cancer

In Dog Diseases Treated by Homeopathy (first published in 1863, before chemotherapy, radiation, biopsies and blood panels), author James Moore advised concerned dog owners on treating cancer: “An operation cannot remove the cancer, but it can remove the tumor, which causes much suffering; the knife is, therefore, merely palliative in its effect. Still, the disease, even then, is likely to return at a period more or less remote.”

Today, the diagnosis isn’t as bleak. Indeed, 50 percent of all canine cancers are curable if caught early enough. Moreover, the disease is mostly an aff liction of old age (tragically, some cancers strike dogs as young as two). It may seem like more dogs get cancer than ever before, but it’s presumably because they enjoy a longer life span, thanks to vaccinations against infectious diseases like parvovirus and distemper, and new treatments for congenital, degenerative and metabolic disorders.

“Cancer” is the broad term for a complex cluster of more than a hundred diseases. Although there are many causes, each type of cancer starts with alterations in genes that tell cells how to function, which triggers accelerated and uncontrolled cell growth. The defective signal may hide in abnormal genes inherited from parents, or germinate when normal genes are exposed to harmful environmental influences.

Some breeds are predisposed to certain types of cancer, and in those cases, a strong inherited genetic component is suspected. It is thought that a small number of genes account for cancer risk, but, although they are directly related to the development of individual cancers, rarely is a single gene the sole cause.

By the time people and dogs pass 70 and 10 years of age, respectively, about 50 percent will have been diagnosed with some type of cancer. The malady accounts for approximately 23 percent of all deaths in people. In dogs, cancer mortality varies across breeds, from under 10 percent to higher than 60 percent.

In general, small dogs weighing less than 20 pounds are at very low risk. (Small dogs have lower levels of IGF-1, a hormone that is related to bone and tissue growth. Researchers suspect this may be one reason they have a lower incidence of cancer.) For instance, the chance that a Chihuahua, Dachshund, Maltese, Miniature Pinscher or Pomeranian will get cancer is less than 10 percent. Breeds with the highest risk include the Bernese Mountain Dog, Bouvier des Flandres, Boxer, Bullmastiff and Golden Retriever (Fleming et al. 2011).

Goldens as Case Studies
The high incidence of cancer in Golden Retrievers appears to be a relatively recent phenomenon. Although the breed was neither over- nor under-represented in a 1988 health study conducted by the University of Pennsylvania School of Veterinary Medicine (Prymak et al. 1988), a health report published 10 years later by the Golden Retriever Club of America (GRCA) identified cancer as the cause of death in 61.4 percent of their dogs (Glickman et al. 1999).

Interestingly, cancer risk in Europeanbred Goldens appears to be significantly lower. A 2010 study put the mortality figure at 38.8 percent (Dobson 2012, Adams et al. 2010). Although much higher than average, the incidence is substantially lower than that found in North American Goldens.

Goldens in Europe and the U.S. may look similar, but there are enough DNA differences to separate the dogs into two distinct populations corresponding to their geographic regions. Gene pools on both continents are large, so breeding between the two populations is rare.

When studied in the lab, genomic differences  suggest that risk for some types of cancer is related to recent genetic mutations in North American Golden Retrievers. And this could be good news: genetic differences between European and North American Golden Retrievers may be key to understanding the etiology of canine cancer overall.

Population, Popularity and Popular Sires
The Golden Retriever is a relatively modern breed, developed in Scotland in the mid 19th century and registered in the UK in 1903, about the same time the dogs were imported to the U.S. In 1925, Goldens were registered with the American Kennel Club, and by the 1950s, the affable sporting breed had gained popularity in this country. Today, they are the third most popular breed in the U.S., with the AKC reporting about 42,000 registrations, a small fraction of the total number of Goldens living in this country. In the UK, Goldens rank eighth on the popularity chart, with 8,000 registrations.

Registration agencies impose strict standards on pedigreed dogs, requiring that the ancestors of each dog be registered as well. This, combined with widespread use of popular sires, means that each breed is a closed population, with no gene flow. The “popular-sire” effect occurs when an animal with desirable attributes is bred repeatedly. Descendants share specific genetic mutations, both good and bad, and those mutations spread rapidly throughout the gene pool, where they may become permanently established, or fixed. (“Fixation” is a change in a gene pool in which at least two variants of a particular gene are reduced to only one.)

When the 1998 GRCA study confirmed that a high number of Goldens were dying of cancer, club members realized they had both a problem and an opportunity. The club’s nonprofit 501(c)(3) fundraising offshoot, the Golden Retriever Foundation (GRF), got off the ground about the same time the survey results were being analyzed.

It started by funding a few cancer studies, including some managed by Morris Animal Foundation (MAF), a nonprofit that invests in science to advance animal health worldwide. Eventually, GRF contributed $1 million and asked MAF to match it if both could agree on a project.

In the meantime, at a MAF canine cancer summit in Chicago, three goals were promulgated: build a tumor archive, fund more canine cancer studies and devise prevention strategies. In response to this collaborative effort, a team of scientists, epidemiologists, veterinary oncologists and surgeons, nutritionists, toxicologists, geneticists, breeders, and donors spent three-anda- half years designing the ideal study. Not an easy task.

Animal epidemiology studies (which deal with the incidence, distribution and possible control of diseases) are few in number, largely because they face so many obstacles. Among them are limited funding, participating private practices using non-standardized methods to record data, pedigrees that are difficult to confirm, and grieving owners who aren’t eager to authorize post-mortem tests. Some cancers are silent killers, so a sudden death may not be attributed to cancer. And, due to attrition, studies are difficult to adequately enroll and don’t last long enough to develop statistically significant patterns.

However, after almost four years of stops and starts, the Morris Animal Foundation Golden Retriever Lifetime Study, the first breed-specific, life-todeath research project of its kind, was launched on August 30, 2012.

The Study
Between 2012 and 2015, MAF enrolled 3,000 dogs ranging in age from six months to two years. Researchers anticipate that within this population, some dogs will get cancer while others will remain cancer-free. Interested Golden Retriever owners completed questionnaires, then met with veterinarians who did physical exams and collected noninvasive biological samples, a process that the owners committed to having repeated annually during the lifetime of each enrolled dog.

Based on observations summarized in questionnaires, researchers hope to identify potentially modifiable risk factors that may account for the high incidence of cancer and other diseases in Golden Retrievers and, eventually, in all dogs. Funded and managed by MAF, the study will investigate the effects of genetics, nutrition and exposure to environmental factors.

Although other breeds are at higher risk for cancer, Golden Retrievers were chosen because their population exceeds that of most other breeds by a large margin: the larger the sample size, the more accurate the data. Additionally, because these versatile dogs perform multiple jobs—from assistance and search-and-rescue work to field, performance and companion tasks—they are subject to a broad range of environmental exposures.

Rodney Page, veterinary oncologist and director of Colorado State University’s Flint Animal Cancer Center and the project’s principal investigator, describes some of the factors underlying the study. “Within the estimates that we currently have, we know that 50 percent of canine cancers are curable with surgery and other treatments. Our study is addressing the ones you can’t cut out: the 15 percent of mast cell tumors that aren’t operable; lymphoma, a whole-body cancer; osteosarcoma and hemangiosarcoma, because they spread rapidly before they’re discovered. These four types of cancer cause approximately 80 percent of cancer deaths in Golden Retriever dogs.” These fatal cancers begin to increase in incidence around five to six years and peak about age nine or ten. However, they may also develop in dogs age two and younger.

More than 2,050 veterinarians are providing health care for enrolled dogs. Annually, they conduct physical exams and report findings online; collect samples of blood, urine, feces, hair and toenail clippings and send them to participating laboratories; submit health information from additional heath visits; collect tumor tissue samples when applicable; and provide owners with information and guidance to help them make a choice about necropsy (an autopsy performed on an animal) after the dog dies.

Participating veterinarian Stephanie Ensley of Bentonville, Ark., who enrolled her own Golden in the program, elaborated on the study’s intent. “The information we’ll gather looks at areas of potential exposure by air, contact and feeding. Owners are expected to provide information as detailed as chemicals used in the home, yard and on the dog, and drinking water sources, to name just a few. When all this information is put together and analyzed, we’ll have an opportunity to find commonalities that may be related to cancer and other diseases. The more data available, the more opportunity to find a connection. On the flip side, we’ll also find commonalities in dogs who live to be 15 and over.”

Among the study’s other expected outcomes are insights into how dog-breeding practices and lifestyle choices might be modified to reduce the prevalence of myriad diseases, and the creation of a repository of biological samples that may be made available to researchers working to develop genetic tests.

Possible Solutions
Appropriate canine candidates for the study were, in large part, identified through the Golden Retriever Club of America, whose membership represents diverse interests and geographic distribution.

As GRCA research facilitator and breeder Rhonda Hovan, who has been a Golden Retriever advocate for 45 years, notes, “Breeders play a special role in the success of the study because they can recruit multiple siblings who share the same genetic heritage. Data from littermates who experience different environmental factors and diets during their lifetimes may provide unique scientific insights that could make a significant impact on the long-term health of dogs.”

One immediate benefit is that veterinarians, dog owners and dogs won’t have to wait until the study is complete to see results that may help influence and improve veterinary medicine. The questionnaire responses are analyzed quarterly, so information is continually streaming into the study, and trends, once validated, will be published as they emerge.

Genetic testing to eliminate dogs from the breeding pool may not be the panacea it first appears. Dogs share more the 300 inherited diseases with humans, from narcolepsy and hemophilia to diabetes and lupus. It’s unlikely that all of these can be bred away from while still maintaining healthy genetic diversity. Reducing diversity increases risk for other diseases to surface in the future, especially in a breed like the Golden Retriever, one that has already experienced diversity loss caused by widespread use of popular sires.

In an article published in Golden Retriever News (Nov/Dec 2014), Hovan cautioned Golden Retriever breeders: “Keep in mind that when we remove a dog from breeding due to a failed health test or for any other reason, we are removing all of that dog’s genes from the gene pool, not just the genes associated with disease or unwanted traits …” She also observed that rigorously removing dogs affected with minor conditions has far more potential to damage future generations than occasionally and carefully breeding them. Breeding away from targeted conditions, she says, is part of an inescapable loop that presents subsequent generations with an elevated risk of having some other problem arise. “When conditions are targeted without good cause, there’s an all-too-real possibility that the ‘something else’ will be worse than whatever it is we tried to breed away from to begin with.”

Eliminating dogs based on genetic tests is not a sustainable way to control disease. A better approach, Hovan explained, is to “test and replace” as opposed to “test and eliminate.” For diseases with a recessive mode of inheritance, breeders can avoid risk by breeding carrier and affected dogs to normal dogs. That way, the genetic variety represented by the line can be maintained for as many generations as it takes to arrive at genetically normal offspring.

As Hovan went on to say, “To make good decisions as caretakers of our breed, we need to know what we’re working with. You can’t change what you don’t measure.” To this end, GRCA is working with a research team from University of California, Davis, to survey the breed’s genetic diversity across types and geographic location, collecting samples from the U.S. and Canada. Referencing this survey, Hovan added, “We want to approach this in a scientific manner. This study will help to clarify what we need to do and provide a road map so we can move forward.”

Could one solution be as straightforward as avoiding environmental triggers that trip biological switches and activate uncontrolled cell growth? Maybe. Researchers expect to collect enough biological samples to accurately define the incidence of each cancer being studied. When the study ends, researchers will also have a detailed life story of every enrolled dog. The hope is that in the long run, data will show relationships between cancers and exposures.

The population-based study is creating a baseline for future research in all sorts of health-related issues. According to Page, “The samples and data we are collecting now will be used by scientists in the future to answer their own questions about health and wellness issues in dogs. Studies will be encouraged that access these assets for analyses of everything from toxic exposures to microbial populations in the gut as they might influence health outcomes.”

Cohort studies like the Golden Retriever Lifetime Study are costly, susceptible to attrition and take a long time to produce statistically useful information. Their value depends on an organization’s capacity to stay in touch and engage all participants. DVM, PhD and CEO of Morris Animal Foundation David Haworth, who also enrolled his dog in the program, summarizes it most concisely: “A study like this can only happen through the active participation of an extended community of dog owners, dogs, veterinarians and study sponsors. I think I can say with absolute certainty that we have one of the most active groups of study subjects of any longitudinal health study ever initiated. After all, they are Golden Retrievers.”

Wellness: Health Care
Relieving Arthritis
Strategies for relieving your dog's arthritis pain

The easy run becomes a stiff walk; the jump to a favorite chair is no longer possible; lying down is accompanied by a deep groan. As our dogs age, things that were once second nature become an effort. Today, thanks to advances in veterinary medicine and companion animal care, many dogs are living to a ripe old age. On the downside, that longevity also increases the odds that they’ll suffer from some form of degenerative joint disease (DJD), or osteoarthritis. There are several types of canine arthritis, but in this article, we’ll address the most common, the age-related degenerative form.

As dogs get older, the cartilage surfaces of their joints begin to thin, and cartilage cells die. When the cells die, they release enzymes that cause inflammation of the joint capsule and release of excessive joint fluid. Extra bony growths (osteophytes) can develop. With severe cartilage thinning, the normal joint space narrows and the bone beneath the cartilage deteriorates. All of these processes set in motion further changes in the normal functioning of the dog’s joint, and an ongoing spiral of pain, lameness, limb disuse/inactivity and muscle atrophy sets in. Many of these changes may be seen on X-rays.

On physical exam, veterinarians rely on a dog’s pain response to joint palpation, detection of crepitus (a crackling or grating sensation felt within the joint), observation of gait and the presence of muscle atrophy to diagnose osteoarthritis. Not all dogs—even those with significant DJD—vocalize when they’re in pain, but a dog whose muscles are atrophied and limbs are stiff, who requires assistance to rise, and does little more than teeter outside to go to the bathroom is without question suffering pain.

DJD isn’t the only reason for a decrease in a dog’s normal activity level, weakness or reluctance to move, so other conditions that could be causing or contributing to this change need to be ruled out. Among the entries on a lengthy list are infectious and metabolic illnesses, cardiac conditions, cancer (particularly bone cancer), anemia, and endocrine conditions such as hypothyroidism or Cushing’s disease. In an ideal world, all dogs would start life with genetically sound conformation and joints. For purebreds, the importance of responsible breeding and the use of OFA (Orthopedic Foundation for Animals) certification or other screening tests to evaluate hip and elbow conformation of prospective breeding animals cannot be overstated. Regardless of a dog’s origins, feeding her a high-quality diet throughout life and maintaining her at her optimal lean body weight are also crucial. If she’s overweight, a healthy weight reduction plan should be instituted immediately.

When it comes to relief, reaching for a single “big gun” pharmaceutical is rarely the most effective approach. Rather, best results are achieved by working with your vet to develop a plan tailored to help with your dog’s specific issues. An integrative, multimodal therapy regime can maximize your dog’s comfort and well-being as it minimizes the potential side effects of certain therapies, and is often more gentle to boot. Following are a few strategies that have been found to be beneficial.

Around the house: Provide well-padded bedding away from cold or damp drafts. (This will also help prevent the development of pressure-point calluses.) Carpeted or padded steps or a ramp to get on and off the bed or couch are advised. Nonskid flooring wherever surfaces are slippery is also very helpful. Outside, your dog may find a gently sloped ramp easier to negotiate than steps.

Body work: Many arthritic dogs appreciate muscle massages, which stimulate blood flow to atrophying muscles. Certified canine massage therapists are available in most areas of the country; many are willing to demonstrate techniques to owners. (Start your search here: members.iaamb.org/users) Warm compresses over sore joints can be soothing, but care must be used to avoid injury from excess heat.

Supplementation: Countless joint supplements are available to promote healthy cartilage and joint health. These contain varying combinations of glucosamine, chondroitin, MSM, green-lipped mussel and other chondroprotective substances. Many veterinarians and owners have found that a small number of these products seem to be helpful. We don’t yet know whether beginning supplementation at a young age benefits every dog. This decision is best made with your veterinarian, taking into consideration factors such as diet and genetics/conformation (e.g., has a dog been diagnosed early on with hip or other joint abnormalities?). The anti-inflammatory effects of omega-3 fatty acids (EPA, DHA) have also been documented to be of help in dogs with arthritis. These are included in some canine arthritis diets, but to be effective, higher levels via separate supplements may be needed.

Exercise: Maintaining mobility through reasonable exercise is important regardless of a dog’s age and the extent of her arthritis. (I’m convinced that what kept a certain red Dober-gal of mine going to 15-plus was her daily quarter-mile walk down the driveway, albeit at her own pace.) A dog with mild, early arthritis can and should get more exercise than an ancient pooch with severe cartilage erosion. Non-weight–bearing exercise— swimming, for example—is excellent if not contraindicated by other medical conditions. Look for a Certified Canine Rehabilitation Practitioner (CCRP) for help with designing an appropriate exercise program. (Visit canineequinerehab.com to see if there’s one in your area.)

Complementary therapy: Many arthritic dogs can be made more comfortable and more mobile by acupuncture. Alternative veterinary practitioners sometimes prescribe formulations of Chinese herbs to support the benefits of acupuncture. (Click on “Find an Acupuncturist” at aava.org.)

Laser: Class IV therapeutic laser is a newer form of treatment that stimulates blood f low to tissues and can greatly improve arthritic conditions.

Pharmaceuticals: When it comes to drugs, there are several options. Adequan injections have long been considered the gold standard for treating arthritis and other degenerative joint diseases in dogs. A potent chondroprotective agent, Adequan (polysulfated glycosaminoglycan, or PSGAG) provides the body with the building blocks of cartilage it needs to assist in repairing its own tissues. Unfortunately, it is often not employed because the initial treatment consists of six injections over three weeks, and it is somewhat expensive. However, rarely have I seen an arthritis patient it did not help, and in my own senior dogs, I get clear reminders if I forget one of their maintenance injections (every three to six weeks, depending on the dog). Adequan is largely without side effects; the main reported side effect is the potential for increased bleeding, but in 20 years of use in dozens of patients (including von Willebrand disease-affected dogs), I have never encountered this problem.

We can add an analgesic such as tramadol, a synthetic opioid. While not an anti-inflammatory, tramadol is a fairly potent pain medication, as well as being inexpensive and reasonably safe. Sedation and constipation are possible side effects, but in my experience, dogs tolerate tramadol wonderfully within the proper dose range. Gabapentin and amantadine also target the nervous system, altering the transmission and strength of pain signals.

We can elect to try a steroid for its anti-inflammatory effect. The caveat with steroids, of course, is that over time, they have a “breakdown” effect on body tissues, including joints. Also, if used for any length of time, they may contribute to the development of diabetes, medically caused Cushing’s disease, liver inflammation, immune suppression or other problems. In order to prevent gastric erosion or ulceration, vets will often prescribe medications such as histamine blockers (famotidine, cimetidine), proton-pump inhibitors (omeprazole) or gastrointestinal protectants (sucralfate). If ulcer symptoms develop, steroids should be discontinued. All this having been said, many ancient dogs with advanced arthritis can get four to eight weeks of benefit from a long-lasting steroid injection.

If none of the above provides sufficient relief, one of the veterinary NSAIDs (non-steroidal anti-inflammatory drugs) might be considered. Canine NSAIDs include Rimadyl, EtoGesic, Deramaxx, Previcox, Metacam and Feldene. While these drugs are highly effective at reducing inflammation and pain, they should not be casually dispensed. I use them on a very limited basis with exceeding caution.

Few drugs are without possible side effects. The potential side effects of veterinary NSAIDs are numerous; they can be severe, and even fatal; their development can be completely unpredictable; and most importantly, they can be irreversible. I hold the “above all, do no harm” portion of our oath close to heart at all times. Unpredictable, irreversible side effects are scary.

For dogs whose systems tolerate an NSAID well, they can be wonderful. However, more than a few dogs, including healthy non-geriatrics, have succumbed to irreversible organ-system failure from sometimes no more than a few days’ worth of NSAID therapy. I have also heard of fatalities from perforating gastric ulcers, seizures and other “adverse events.” The FDA has documented thousands of such deaths, which by their own estimation represent a fraction of total cases.

Blood work should be done before an NSAID is dispensed to confirm normal liver and kidney function, red blood cell count, and other parameters. These tests should be repeated at regular intervals to confirm that the NSAID is being tolerated. Ask your veterinarian for a copy of the pharmaceutical company’s Client Information Sheet; he or she should also advise you about symptoms to watch for, including, importantly, any increase in water consumption or urination. The medication should be stopped immediately if symptoms develop. NSAIDs must never be given with aspirin or any form of steroid; doing so can result in death.

And please, do not give your dog over-the-counter pain medicines without consulting your veterinarian! Dogs have died tragic, unnecessary deaths from a variety of seemingly innocuous pills, including a healthy five-year-old dog whose owner gave her several days’ worth of Ibuprofen, which is toxic to canines (and, for that matter, felines too).

Let’s strive to support fit, structurally sound dogs; maintain them with excellent nutrition and age- and breed-appropriate exercise and at optimal body weights; and begin supplemental integrative therapies when they show symptoms of and are diagnosed with degenerative arthritis. Let’s work our way up to the “big guns” prudently and judiciously. Here’s to long, happy and comfortable lives for all our dogs!

Wellness: Health Care
The Scoop on Poop
Abnormalities in stool color and consistency may indicate an underlying problem.

I’ll be the first to admit that I stand outside watching each and every performance of my dogs’ “poop show.” This isn’t just a weird sort of voyeurism—rather, it’s a good way to know what’s going on with a dog’s health. If you, too, like to see what’s coming off the production line, keep in mind that the number-one rule of thumb when considering canine elimination is reproducibility. Stools should generally have the same color, size and consistency each and every time.

Many things can cause variations in a dog’s stool. Some of the more common are dietary indiscretions (“garbage gut”) or a change in diet, stress (known as stress colitis), infectious disease, inflammatory conditions, or obstructive processes. Or it may be idiopathic (meaning, we just don’t know what causes it).

A couple of episodes of diarrhea generally don’t constitute an emergency. However, there are situations that do warrant an urgent evaluation. When your dog refuses food or water, vomits, or acts ill or “off,” a trip to the vet is indicated.

Your vet may ask you to bring in a stool sample for analysis. A tablespoon is generally plenty. Also, freshness counts; fecal samples less than an hour old give the best results. If you’re not able to collect one this quickly, get a morning sample, double (or triple!) bag it and keep it refrigerated until your dog’s appointment.

Testing usually starts with a screen for giardia and “O & P,” specifically looking for giardia protozoa as well as ova (eggs) and parasites. During this evaluation, the laboratory technician will also check for overgrowth of normal gastrointestinal (GI) bacteria, which we refer to as clostridial overgrowth. If your dog is acting ill, in addition to having diarrhea, other diagnostics such as blood work and radiographs may be indicated.

FIELD GUIDE
While normal stools can be many shades of brown, some abnormalities in color and consistency may indicate an underlying problem.

1. Streaks of bright red blood and/or mucus on the surface of a mostly normal, formed stool. This is generally caused by inflammation in the large intestine, where mucus is secreted to help protect the intestinal lining. While this does not necessarily indicate an emergency, it’s a good idea to keep a close eye out for further changes in your dog’s behavior and stool.

2. Soft-formed to liquid brown diarrhea, with or without streaks of blood. “Cow patty” and “soft-serve ice cream” are two frequent descriptors. As with the previous type, it is generally not life-threatening as long as there are no other signs of concern and it begins to improve within 24 to 48 hours. If your dog is acting normally otherwise— eating well, not vomiting, good attitude —a wait-and-see home approach may be tried (more on this to follow). Here again, red blood indicates inflammation and bleeding in the colon but does not necessarily mean that your pet is bleeding internally, as is often thought. This is a step up in concern from the previous condition, in the sense that the stool is now softer.

3. A large volume of bloody, watery, diarrhea. This one does require immediate evaluation by your veterinarian, especially with smaller dogs, as it can be an indicator of a common condition called hemorrhagic gastroenteritis, or HGE. (Read more about it here: thebark.com/hge) Tissue sloughing from the intestines gives it a distinctive appearance, and it’s often described as “raspberry jam” diarrhea.

4. Black, tarry stools. This generally indicates bleeding somewhere higher up in the GI tract, such as the stomach or small intestine, and also requires an urgent trip to the vet. A bleeding ulcer (oftentimes caused by steroid or NSAID use) or more generalized bleeding, such as from rat poison, heat stroke or an immune-mediated disease, can display as black, tarry stools. The appearance of the stool is due to the presence of digested blood, and can indicate that a large amount of blood is being lost. In these cases, I usually recommend blood work and an ultrasound to better assess the lining of the intestinal tract.

5. Yellow-orange or pasty, light stools. This may indicate the development of liver or biliary disease, or a too-rapid transit through the small intestine to the colon. A more thorough examination, including diagnostic tests, is in order.

6. Grey, greasy stools. A possible indicator of inadequate digestion and malabsorption of nutrients from the small intestine, this type of stool is typical of exocrine pancreatic insufficiency (EPI), also called maldigestion, a disease in which the pancreas no longer functions as it should. The pancreas is responsible for producing digestive enzymes, and without them, nutrients cannot be properly absorbed. Both German Shepherds and Rough-Coated Collies are commonly afflicted with EPI

7. Green stools. In the ER, I have seen dogs with green stool, and upon examination of the fecal contents, have discovered the cause to be undigested rat bait mixed in with normal stool. This condition also calls for an immediate trip to your veterinarian. Although relatively uncommon, rat poison can also cause both bright blood and dark, tarry stool, so—whether or not you think your dog could have had access to them—please let your veterinarian know if there is any possibility of exposure to rodenticides.

8. Worms. Most of the time, you will not actually see worms in the stool. We typically diagnose worms by looking for their eggs under the microscope; we can tell what type of parasite is present by the shape of the eggs. Occasionally, however, you may see white spaghetti-like shapes (typically, roundworms) in the stool, particularly with puppies. You may also see small flat worms on the outside of the stool or rectum, or “dried rice” in your dog’s sleeping areas. This typically indicates tapeworms, which can take over when fleas are allowed to flourish. Although seeing worms in the stool is not an emergency, an appointment with your vet is in order so you can get medication appropriate for the type of parasite present.

Pages