Culture: Science & History
Unraveling the genetic tapestry provides clues to breeds and their mixes
A mongrel dog is like a box of chocolates: You never know what you’re going to get. And therein lies the appeal. What’s more fun than serendipitous unpredictability all bundled up in puppy fur? But when that puppy grows up, we inevitably make assumptions about her ancestry based on how she looks and behaves. Our logic goes like this: “If my pooch is long and low to the ground, and she never barks, she must be a Corgi/Basenji mix.”
But it’s much more complicated. The genes—and there may be hundreds—that work together to make a Corgi look like a short-legged Shepherd may be completely different than those responsible for a Basset Hound’s low-slung carriage. With some exceptions, scientists cannot yet connect genetic dots to specific traits. But they have discovered something tangible that measures some of the differences between breeds: genetic patterns of organization displayed on a scatter graph that answer the question, “What’s the same and what’s different?”
A scatter graph provides a symbolic visualization of DNA, wherein each individual dog contributes one point. The resulting pattern indicates the type and strength of the relationship between individuals. The more the points cluster around each other, the more alike they are.
In addition to simplifying methods used to find markers for breed-related disease, the researchers identified patterns of “breedness” and tracked the history of breed DNA. At the same time, by following mitochondrial DNA, genetic material passed down from mother to offspring without changing, they traced the breed’s journey.
Depending on how much time is attributed to a generation and how many generations are involved, scientists can estimate how much time has passed. Based on this tracking, it has been suggested that it took 5,000 years to develop and refine a handful of the world’s 350-plus breeds, and about 400 years to create the rest.
Research indicates that four distinct breed groups are ancient: (1) Middle Eastern Saluki and Afghan, (2) Tibetan Terrier and Lhasa Apso, (3) Chinese Chow Chow, Pekingese, Shar-Pei and Shih Tzu; Japanese Akita and Shiba Inu, (4) Arctic Alaskan Malamute, Siberian Husky and Samoyed. Although the 13 breeds look different, they are so closely related that they are represented by a single genetic cluster. It’s likely they all originated from the same stem-parent—proto-breed, if you will—who roamed the Asian continent.
As humans migrated from one place to another, this ubiquitous proto-breed trotted along, bringing with her the ingredients needed to cook up all the breeds we’re familiar with today. Her offspring performed work unique to each geographical region, such as hunting, hauling or guarding. Isolated and mating only with each other, “accidental” breed types exhibiting consistent shape, color and behavior emerged.
No matter what historians might claim—scent hound to sight hound, bird dog to bad dog—evidence produced through genetic research indicates that all remaining breeds have been concocted in the last 400 years. Although closely related to one another, they can be identified as distinct based on the way their DNA separates.
How They Do It
“We look at ’breedness‘ among dogs. Our canine database is built with 10,000 samples of 108 breeds. We ran 400 markers to identify the best markers for a ’breedness‘ test against 38 breeds. We created a panel of 96 pieces of DNA that split dogs into their identified pure breed. In our preliminary test, we found that individual purebred dogs cluster with other purebreds.” Initially, MMI chose 38 AKC registered breeds from their database, selected for their popularity based on number of registrations. Recently, as DeNise notes, they increased the number to 108 breeds. This jump in breed recognition required testing thousands of markers to identify the just over 300 markers that characterize these 108 breeds.
Breeds are created a number of ways. In simple terms, when breeders interfere with natural reproduction and rigorously select for traits favored by humans, specialized breeds like Retrievers, Spaniels, Hounds and Terriers are the result. Saving spontaneous mutations in a litter of dogs, repeating the breeding to get more of the same mutation, and breeding those dogs back to one another has resulted in the English Bulldog, Chinese Crested and Inca Hairless. More recent breeds, such as the Airedale, Australian Cattle Dog and Doberman, are the result of crossing older breeds to make new ones.
When kennel clubs closed gene pools in the late 19th century to suspend change in registered dogs, breeds drifted toward a more uniform stereotype. Until the early 1800s, an assortment of dogs with similar talents who could produce somewhat similar offspring were awarded the right be called a breed. Breeds evolved, flourished and disappeared when jobs were eliminated. Tumblers, who mesmerized prey by “winding their bodies about circularly, and then fiercely and violently venturing on the beast,” disappeared when guns came into widespread use. Turnspit dogs, who made a living running on a wheel to turn meat so it would cook evenly, received their pink slips when technology improved cooking methods.
By and large, Victorian society was not so pragmatic; sentimentality and commercial opportunity were catalysts for saving unemployed breeds from their inevitable demise. As a result, many Terrier breeds went from killing varmints in the barnyard to killing time in the Victorian parlor in less than a decade.
Whereas previously, a breed was a regional product maintained and preserved by a small community of knowledgeable people, commercial interest in the well-bred pet dog initiated a shift in breeding practices during the Victorian era. The old-money kennels operated as a pastime by the wealthy gave way to a large number of small, commercially operated kennels run by entrepreneurs of modest means and experience.
Germane to this tale is that, according to the unwritten rules governing canine physiology, anatomy and behavior go hand in hand. One cannot be changed without affecting the other. Victorian enthusiasts who were busily adding aesthetic traits to utilitarian breeds were creating not only subtle variations in type, but in many cases, modifications in behavior as well. As utilitarian breeds went from working hard to hardly working, many exhibited new physical and behavioral characteristics that were compatible with their augmented duties as companion animals. Breeders claimed the “sub-breeds” as their own, made up new names and registered each one.
However, no matter how they’re sliced and diced, reducing and suppressing genes so they aren’t expressed doesn’t mean they’ve been eliminated. They’re still lurking and, depending on the method used to analyze the DNA, the lurkers often show up in the results.
Most people assume all mixed-breed dogs had a purebred ancestor at some time in their recent heritage. But in fact, this is not necessarily the case. When you run a mongrel’s DNA through a computer program, the algorithms attempt to group breeds together on a scatter chart. If the heritage of the dog is such that it is not in MMI’s database of 108 breeds, the program tries to find varieties that are most alike. Because at least one or two of the handful of ancient breeds are in every modern dog, sometimes the program will identify an ancient breed in the mix. “In the report we send to the client, we use the terms ‘primary,’ meaning the majority of the DNA matches a breed; ‘secondary,’ meaning less than the majority of the DNA but a strong influence nonetheless; and ‘in the mix,’ meaning the least amount of influence,” DeNise notes. That’s how you might get an obscure breed in the report. For instance, a 35-pound mongrel with a tablespoon of Husky and a teaspoon of Border Collie may also have a dash of Borzoi, because before gene pools were closed a century ago, Huskies were crossed with coursing hounds to add speed.
Don’t Judge a Pup by Her Cover
Researchers are intrigued by data that suggest expressed traits are somehow turned “on” and “off” by other genetic components, thus causing the wide variations in canine form and behavior. For instance, it’s possible that many breeds have the genetic potential for a black tongue, but only a few breeds have the molecular mechanism to switch that color on. So that black-tongued mutt may not have any Chow in the mix after all.
On the other hand, the results may show that a quintessential Heinz 57 has the genetic makeup of a single breed and it could be one she looks nothing like.
DeNise explains it this way: “In a population of any breed, there are dogs that are carriers but don’t exhibit phenotype [observable characteristics]. If you reduce the size of breeding population—creating what we call a bottleneck—you start increasing the frequency of deleterious traits, like dwarfism or white coat. If we looked at the DNA of, for instance, a group of white mini-German Shepherds, they would probably cluster with German Shepherds. After they’ve intermated for five to six generations, we may not come up with that. They would cluster with each other. If breeders were changing allele frequencies quickly, you could do it very fast.
“There are always contradictions that make you say, ‘Huh, that’s really weird.’ One odd thing that happens is due to some sort of random assortment of genes in mixed-breed dogs. The algorithm may identify a breed that is not consistent with the physical appearance of the dog. We sometimes get an indication of this when the certificate is printed with the picture of the dog provided by the owner, and the certificate is reviewed by our customer service department prior to mailing it to the pet owner.”
A 90-pound, wiry-haired mongrel who swims, chases balls and makes goo-goo eyes like a Golden Retriever and whose only pedigreed relative is a very distant Chihuahua confounds the process, but says a whole lot about the complexity of canine genetics and why some scientists devote their careers to studying canine evolution. Extreme variation in anatomy and behavior is unique to the domestic dog. If humans were an equally anomalous species, we’d weigh between 20 and 650 pounds and range in height from three to 10 feet. In dogs, adaptations change with such speed that scientists suspect there may be a clue in the canine genome that could reveal how evolution works.
Sorting It Out
MMI can’t as yet define the percentage of “breedness” in mixed-breed dogs. One reason is that some breeds cluster loose and others tight. Why this happens isn’t clearly understood. German Shepherds, Standard Poodles and Collies cluster tight. Miniature Poodles cluster tight, but Toy Poodles cluster loose. Within their breeds, Labrador Retrievers and Beagles often cluster as two different groups. According to DeNise, “Labs from the United Kennel Club that are bred specifically for hunting and AKC Labs do not necessarily cluster as one breed. And AKC Beagles and Beagles bred specifically for research don’t cluster together either.”
She adds, “In my opinion, it’s possible that a population that increases rapidly doesn’t cluster as well as those populations that have remained static. This is because, as you increase a population to accommodate breed popularity, people breed everything, including animals that may not exhibit all the physical characteristics that are desirable.”
And even when dogs look alike, they can display behavioral differences. As DeNise notes, “We understand so little about how behaviors are coded. Many behaviors are learned, but there are probably multiple genes that are responsible for herding, birding, heeling—these kind of hard-wired behaviors.”
Scientists are eager to tease out genetic connections to breed-associated motor patterns. When wolves hunt, they display these behaviors sequentially: orient > eye > stalk > chase > grab-bite > kill-bite > eat. Artificial selection, however, extracts and segregates these patterns in incomplete sequences. In certain breeds, individuals perform the abbreviated motor pattern repeatedly. A Pointer who stops dead in her tracks and stands stock still with her front leg held rigid in mid-stride to indicate the presence and position of game is the lofty goal of bird-dog breeders. To wolves, it’s just a good meal interrupted.
Combinations of canine anatomy and behavior push and pull one another along in a rhythm of interconnected patterns in relationships that may not be as random as they appear. Like principal components of an automobile in which the size of the engine and the weight of the body directly affect efficiency, it appears that dogs, too, have integral parts wherein one component is proportionate to the other.
Researchers don’t fully understand the relationship, but they are making headway. As reported in Genetics (June 2008), a team of scientists identified a few single genes that regulate systems controlling skull shape, weight, fur length, age span and behavior. Because mutts are combinations of DNA from different breeds, they may hold the answer to how the genes influence multiple traits.
Scientists suspect that many evolutionary secrets are hidden in the dog genome. For dog lovers, deconstructing Molly or Max’s mixed-breed heritage is an interesting intellectual mystery to be discussed at cocktail parties or the dog park. For scientists, their genetic material is nothing less than an instruction manual for species building. Whereas populations evolve over the course of millennia through the process of natural selection, dogs can change so rapidly and abruptly that they represent evolution at hyperspeed. How it happens remains a puzzle. Now scientists are looking to mutts to find the missing piece.
News: Guest Posts
New evidence of ancient bloodsuckers
Flea problems got you down? Well, count your lucky stars that you’re not raising a pack of pet Brachiosaurus. Recently, paleontologists in China discovered fossil evidence of Jurassic fleas that were as long as a thumbnail with sharp “mouth parts” all the better to dig into dinosaurs’ tough reptilian skin. Shudder.
Dog's Life: Lifestyle
A few genes make all the difference
My relationship with dogs is sometimes a bit split. One side of things is that I love them, for all the reasons everybody reading this understands so well. Another side of my relationship with dogs is my fascination with them—a true scientific interest, based on some of their extraordinary characteristics. And research about their genetics has continued to add to their appeal as creatures worthy of great attention, even beyond the fact that they are so lovable.
From the diversity of forms seen in the domestic dog, it’s easy to come to the conclusion that their genetics are unusual. Though other domestic animals including chickens, horses, cows, sheep and cats have many different breeds, dogs alone have the amount of physical variation that is represented by Great Danes, Dachshunds, Pugs and Borzois. Animal lovers are generally interested in that fact, but all scientists ought to be astounded by it, and I most definitely am.
The selective breeding that has led to the range of forms in this species is a fascinating genetics experiment. Geneticists are grateful to the “field work” done by countless breeders over many generations because the dogs that have resulted provide a way to understand things that can’t be learned elsewhere.
One of the most fascinating recent discoveries that makes use of the variation in dogs is that it’s only a few genes that are responsible for the huge range of differences in the appearance of different breeds of dogs. The incredible variation in dog size, fur type, length and color, ear shape and position, and shape of the nose is controlled by just a few dozen gene regions.
In other species, the genetic control of traits such as size and shape is much more complex. For comparison, human height is controlled by around 200 gene regions. Until it was investigated, researchers assumed that underlying the incredible diversity of canine appearances was a corresponding genetic diversity, but it’s just not so. The more we learn about dogs, the more fascinating they become.
Scientists have only recently caught on that canines are not just a fertile subject for their particular specialties — psychology, anthropology, zoology, ethology and more — but also a topic that the publishing world seems eager to promote.
This trend has been a long time developing. Nobel Prize–winner and ethology’s co-founder, Konrad Lorenz, wrote Man Meets Dog (1950), breaking ground that lay dormant until anthropologist Elizabeth Marshall Thomas’s bestseller, The Hidden Life of Dogs (1993), reintroduced the genre of dog studies to the non-scientist reader. A few years later, journalist Mark Derr followed up with Dog’s Best Friend (1997), a book that grew out of his Atlantic Monthly investigative piece about the AKC and the dog-show world. Another dry spell was finally broken by psychology professor Alexandra Horowitz’s Inside of a Dog (2009), which garnered an extraordinary amount of well-earned praise. At long last, it seems that the (overly) popular dog-memoir craze has given way to illuminating and well-researched books that explore the science behind our favorite species, written for the general public.
For example, in the May issue of Bark, we reviewed Dog Sense, a fascinating book by British anthrozoologist John Bradshaw, in which the author provides a compendium of current research (both his own and others’) into dogs’ origins and behavior. More specifically, he details their evolution from a wolf-like ancestor into proto-dogs and then the first domesticated species; he also investigates how this very long-term relationship has affected both canines and humans. He goes on to clearly explain how today’s dogs differ behaviorally and culturally from wolves, and why the dominance/ pack paradigm put forth by many trainers (including Cesar Millan) is not only the wrong way to understand dogs but has also done them a great disservice. It makes for engrossing and thought-provoking reading.
Paleoanthropologist Pat Shipman takes a similar synoptic approach in her engaging new book, The Animal Connection: A New Perspective on What Makes Us Human, and adds valuable insights into the dog’s evolutionary story. She combs through research in her own field as well as in archeology to test her hypothesis that animals (dogs among them) have shaped our species’ evolution. As she says, “I believe that a defining trait of the human species has been a connection with animals…. Defining traits are what make humans human … and they are partially or wholly encoded in our genes.” She does a rigorous investigation — every bit as compelling as a forensic TV drama — into the three big advances that contributed to our modernity: tool-making, language and symbolic behavior, and the domestication of other species to support this position.
In the chapter, “The Wolf at the Door,” Shipman suggests how domestication might have happened. As importantly, she refutes other theorists, such as Raymond Coppinger and his “protodog- as-village-pests” model. She writes about Belgian researcher Mietje Germonpré, whose work recently dated a proto-dog fossil skull to 31,680 BP — proving that dogs were domesticated long before humans congregated in settlements. (It was an amazing 20,000 years before the next species, the goat, was domesticated.) Shipman questions why so few representations of wolves/dogs (as well as human figures) appear in prehistoric art, and incorporates anthropologist Anne Pike-Tay’s suggestion that if domesticated dogs were helping us hunt, they were “perhaps placed in a completely different symbolic category from other animals,” adding, “dogs might have been put into the human family category as an extension of the hunter.” All of which attests to the fact that dogs have been a part of the human family since our own prehistory — an extremely long time.
All of these books, the classics and the current crop, should be read by dog lovers. Not only do they contribute to our understanding of our first friends, they also have the potential to improve dogs’ welfare by educating us as to what we can and can’t expect from them. We owe it to dogs to learn more so this age-old relationship can grow even stronger. Here’s hoping this trend continues and more groundbreaking books are on the way.
Avery Publishing, 320 pp., 2010; $26.00
After the birth of Snuppy, the world’s first cloned dog, a handful of biotech entrepreneurs envisioned a thriving business that would provide grieving dog lovers with genetically identical clones of their deceased pets. In Dog Inc., Pulitzer Prize-winning investigative journalist John Woestendiek exposes the grave folly behind those science-fiction dreams.
Woestendiek travels between the United States and South Korea, following the companies looking to cash in on cloning technology, and their clients, who hope cloning really will approximate resurrection.
Although much of the book focuses on the salacious story of Bernann McKinney, a woman obsessed with cloning her Pit Bull, the strength of Dog Inc. is in Woestendiek’s ability to lay out the science and laboratory politics in a way that’s both accessible and engaging. Readers will understand the X-inactivation process that made the first cloned cat so physically distinct from her progenitor — and, consequently, such a public relations failure — as well as the allegations of scientific fraud levied against Woo Suk Hwang, one of the pioneers of canine cloning.
Woestendiek never outright condemns canine cloning, but the details leave little question as to where he falls in the debate. He shines light on the poor treatment of the laboratory dogs used in cloning, the cloned puppies who do not survive the process and the heartbreaking fate of Snuppy himself. As for the actual clones, Dog Inc. tracks kittens, puppies and even a bull cloned at great financial and biological cost, only to prove physically and behaviorally distinct from their genetic parents.
The book serves as a valuable reminder that, like people, our pets are far more than the sum of their DNA.
Making sense of dogs
What is an anthrozoologist, anyway? Turns out it’s someone who studies human-animal interactions, and John Bradshaw, who directs the world-renowned Anthrozoology Institute based at the UK’s University of Bristol (and founded it at the University of Southampton), is pre-eminent among them. For more than a quarter of a century, he’s investigated the behavior of dogs and their people, and his findings have been widely published. In Dog Sense — his best-selling, recently released book — he expands upon his belief that “the future of the dog does not lie simply with the blunt instruments of legislation and regulation, but with better public understanding of what dogs actually are, their needs and wants.” Recently, Bradshaw shared his thoughts on evolution, training (debunking the myth behind the “dog as wolf” model), changes in breeding practices in the UK and what lies behind dogs’ attraction and attachment to us, among other intriguing ideas.
Bark: Why do you think that a proto-dog — a transition from wolf to dog — evolved?
John Bradshaw: My theory — and I have nothing to back it up — is that something happened in the brains of certain wolves that made dual socialization possible. Humans developed a propensity to take in pets, and then these particular wolves came along — these would be the protodogs. They would have looked exactly like wolves. This was not an intervention on our part, but rather, a very different cultural environment.
B: Most researchers refer to domestication as a one-way street. Didn’t other species, including the wolf and proto-dog, also have an effect on our own evolution?
JB: Domestication was a long and complex process; speculatively, I would [say] that there were several failed attempts. Researchers who are studying human evolution and the human brain pretty much say that our own evolution — at the genetic level — wasn’t influenced by dogs. But, of course, our culture has been profoundly influenced by them.
B: Do you think it’s possible that we hunted together, or perhaps learned or honed our own skills by watching wolves hunt?
JB: I don’t think we were hunting partners, to begin with, but one of the versions of human evolution that I strongly subscribe to comes from Steven Mithen, a cognitive archaeologist and professor of early prehistory, who studies the evolution of the human mind and why we are different from the Neanderthal — why they died out and we didn’t. One of the key [dissimilarities] he points to is our ancestors’ ability to think like animals. They could put themselves in the place of an animal — that they, in fact, had a connection to the animals. So we would be able to think, “If I were a wolf, what would I be doing?” or, “If I were a deer, what would I do now?”
B: If scientists have concluded that wolf behavior is different from that of dogs, why do people still consider the lupomorph (wolf pack) model as a determinant of canine behavior?
JB: They have a good excuse, which is that in terms of their DNA, dogs and wolves are so similar. However, that doesn’t mean there is similarity in their behaviors.
B: If the wolf model isn’t appropriate, what is?
JB: The behavior of feral, or village, dogs in Italy, Russia and India has been studied recently, and results show that those dogs are much closer to the ancestors of pet dogs than wolves are. These are urban feral dogs, high-density dogs, dogs in large groups. Earlier studies [of feral dogs] were conducted in environments in which the dogs were being persecuted and are like the early captive-wolf studies: not reliable.
B: You write that there is little evidence that hierarchy is a particular fixation of dogs — that dogs do not want to dominate us — but so many trainers (including Cesar Millan, as you note in the book) and others use this construct to explain dog behavior. Why is this wrong and what are its implications?
JB: Part of the problem is that confrontation makes good television, and attracts programmers, but having a confrontation in your living room with your own dog isn’t the best way to train a dog. The more effective way is to use reward-based training, which can be (by television standards) incredibly dull, since it may take hours or sometimes weeks. My colleagues and I are appalled by the popularity of this style of confrontational dog training. I don’t know what the situation is in your country, but in the UK, we have a new Animal Welfare Act, and that kind of training goes against its recommendations. The law reads, “All dogs should be trained to behave well, ideally from a very young age. Only use positive reward-based training. Avoid harsh, potentially painful or frightening training methods.”
B: Have you seen any changes in breeding practices in the UK as a result of the BBC’s “Pedigree Dogs Exposed” documentary?
JB: The genetic isolation of breeds has brought about a dramatic change in the canine gene pool. Three inquiries have been commissioned: one by the Royal Society for the Prevention of Cruelty to Animals, another by the government and a third by the Kennel Club itself, but there is still a great deal to be done. There are problems implementing the studies’ conclusions because the KC, like the AKC, is a federal structure made up of individual breed clubs. The federation has no power to tell the member breed clubs what to do.
B: Many people use puppy testing to predict a dog’s adult character. Do you feel this is valid?
JB: Dogs are born to become friendly toward people, a process that starts in about the third week of their life and goes on for several months. This process of socialization is well charted. At 16 weeks, the window of socialization to people begins to close, though it stays open a bit longer for socialization to other dogs.
B: You write that dogs have been so heavily selected to form strong attachments to humans that many suffer from separation anxiety — up to 50 percent of Labs bred in the UK, for instance. On what is this finding based?
JB: It comes from my own research and that of others. We concluded that many dogs experience this anxiety at some time in their lifetime. In one longitudinal study, we followed puppies, 40 in all, litters of Labradors and Border Collies, from eight weeks to 18 months old. Over 50 percent of the Labs and almost half of the Collies showed some kind of separation distress. Subsequent studies, during which we filmed dogs left alone, showed that self-reporting by owners underestimates the scope of the problem.
B: One of the most controversial positions you take is that being in a shelter may damage a dog. Was consideration given to contributing factors such as the length of time spent in a shelter, the condition of the facility, the interactions a dog has with other dogs and humans there, and the dog’s personality and history?
JB: We want to understand what is going on inside these dogs, and I am not in any way blaming rescuers or shelters. Dogs who have been attached to a family may suddenly wind up in a shelter for a variety of reasons: family breakup, job loss or the dog’s behavioral problems. Dogs will be very upset by this and when they arrive in a shelter, their cortisol level [a stress-related hormone] goes sky high. We know this because when we’ve taken urine samples, we’ve had to dilute the urine to even get a measurement — it was that high. They don’t have the resources to cope and go into hyperdrive, desperate to please people. As a result, in a shelter setting, dogs actually can be easily trained.
B: Dogs clearly love us, and demonstrate that in many ways, but is this what motivates them to obey us and follow our lead?
JB: Human contact has a high-level reward value for dogs; simple attention from us is rewarding. And if that attention comes while playing with them, it can be a double reward. You can train a dog with a tennis ball, but while the game is important, it is not the only thing. The real treat is the interaction. Withdraw your attention, ignore the dog, and the dog will find this withdrawal of attention aversive.
Dog's Life: Lifestyle
How big is the range?
Last weekend, there was a chocolate Lab at the athletic fields where my husband and I were playing flag football with some other people, including his guardian. Both my children had a ball running around with Porter on the sidelines. He was very sweet and well trained. He played Frisbee, chased some of the adults around if they enticed him to do so, and got off the field and sat when asked to do so. He was energetic, but not overly aroused, let everybody pet him, and was generally a credit to his breed.He was also enormous. He weighs 105 pounds, and while nobody would describe him as svelte, he wasn’t overly fat as we regrettably know so many dogs in this country are. It’s hard to say, but I would guess that his perfect weight would be somewhere in the low 90s, which is still a large Lab. He was broadly built and unusually tall for his breed. His loping style of running made me wonder whether he had any Great Dane in him, but I was told he’s all Lab. Lately, I have seen quite a few Labs who are pretty large, and yet I’ve also seen ones who are so small I suspect people often think they are adolescents who are yet to reach full height, event though they are 3-years-old, 5-years-old, or more—certainly full grown. I’ve seen dogs of other breeds who seem far from typical in size, including a Brittany who is 5 inches taller than all his littermates and an Airedale Terrier who was much closer in size to an average Irish Terrier. I know that despite breed standards, what’s popular in terms of size varies over time. And sometimes, for whatever reason, dogs are born who don’t match the size typical in their lines. Coming from a family with women who range in height from 4’9” to 5’11”, I am very interested in diversity in size among relations. Do you have a dog who is either unusually large or unusually small for the breed?
Dog's Life: Lifestyle
An ethologist who loved dogs
As this year’s Nobel Prizes were announced, I faced my annual wish for anyone interested in dog training and behavior to know that three scientists in the field of Ethology have been awarded this prize. In 1973, Niko Tinbergen (The Netherlands), Karl von Frisch (Austria) and Konrad Lorenz (Austria) were awarded the Nobel Prize in Physiology or Medicine “for their discoveries concerning organization and elicitation of individual and social behaviour patterns.” They are regarded as being among the founders of the field of Ethology, which is the study of animals in their natural habitat.While they are best known for their work with birds, insects and fish, all of them studied a variety of species. Konrad Lorenz was quite interested in dogs, and wrote a wonderful book called Man Meets Dog. One of the great contributions of this book to the study of animals concerns Lorenz’ interdisciplinary approach to understanding dogs. As Donald McCaig states in the introduction to a recent edition, “He made it respectable to bring the practical observations of animals trainers and handlers into the academy. It was a great first step, and although the gulf between academic study and practical applications remains with us today, Lorenz did much to merge what is known from different areas into a cohesive body of knowledge in order to further our understanding of animals.” Some of my favorite aspects of this book are personal stories. For example, Lorenz describes the close relationship between his future brother-in-law, Peter, and a Newfoundland named Lord who joined the family when the dog was 1½ years old. Peter was the smallest of four brothers, and the youngest in a gang of boys who participated in their fair share of mischief. The dog protected him to such a degree that even his schoolmaster dared not raise his voice to Peter, lest he growl and leap up with his massive size on the shoulders. Naturally, this dog kept the other boys from teasing or bullying him as well. Lorenz discusses his great sadness at losing dogs to old age. When he was 17, his dog Bully died of a stroke and he describes his sadness that the dog had left no offspring. For a long time after Bully’s death, Lorenz says he heard the pattering of Bully’s peculiar gait following after him as he had done for so many years in life. He writes, “If I listened consciously, the trotting and snuffling ceased at once, but as soon as my thoughts began to wander again I seemed to hear them once more.” Only when his new puppy Tito began to run behind him and follow him everywhere did the “ghost” of Bully cease to follow him in his mind. Years later when Tito died, Lorenz felt a great guilt knowing that another dog would take the place of Tito just as Tito had replaced Bully in his heart. He says he felt ashamed of his own unfaithfulness and decided that for the rest of his life, only descendents of Tito would be his companions. Besides being a brilliant scientist, Lorenz is an excellent writer whose words are equally effective when he is discussing scientific principles as when he muses on the transience of life: “In human life there is enough suffering—of which everybody gets his share—when we come to take leave of someone we love, and when we see the end approaching, inevitably predestined by the fact that he was born a few decades earlier than ourselves, we may well ask ourselves whether we do right to hang our hearts on a creature that will be overtaken by senility and death before a human being, born on exactly the same day, has even passed his childhood.”
Dog's Life: Lifestyle
Should we be worried about resistance
Heartworm disease is a horrible and potentially deadly disease that is fortunately preventable with medication. However, in recent years, animals in the Gulf region have been testing positive for heartworm, despite being on a prevention medicine. This has many people worried about a potential resistant superbug.
In response to the growing cases, the American Heartworm Society and Companion Animal Parasite Council met earlier this year to "explore the potential relationships between resistance to heartworm products and veterinary and pet owner compliance, loss of product efficacy and heartworm testing and treatment protocols."
For instance, 50 percent of people who buy heartworm preventative do not give the medication to their dogs as directed. The efficacy of heartworm preventative is greatly compromised if not given as intended.
The meeting concluded that more research is necessary, but that the investigation should not lead to dropping heartworm medicine, since year-round use is still the most effective way to prevent the deadly disease.
In human healthcare, there’s so much talk of antibiotic resistant supeprbugs that I avoid excessive medications and vaccines when possible, for both myself and my dogs. However, heartworm preventative is one medication I don’t skip with the pups. It’s such a serious disease and I hope that the possibility of a superbug is unfounded.
For more information on heartworm prevention, symptoms, and endemic areas, visit the American Heartworm Society website.
Unlocking secrets of canine DNA
The young son of Stanford University researcher, Prof. Carlos Bustamante, answered the phone this morning at 7 a.m., and handing the phone to his father said, “Oh, it’s for you.” News of his $500,000 MacArthur Award (“genius award”) came as a welcomed surprise to Bustamante. His work focuses on understanding the evolution and interactions of population genetics in dogs, humans and even plants and pathogens.One of the most recent findings of Bustamante’s group at Stanford, in collaboration with Cornell and the National Human Genome Research Institute, was that—“in contrast to humans”—many physical traits in dogs are determined by very few genetic regions. For example, a dog with version A of the “snout length” region may have a long, slender muzzle, while version B confers a more standard nose and C an abnormally short schnoz. And let’s say X, Y and Z in the “leg length” region bestow a range of heights from short to tall. That would mean that in this example an A/X dog would have a slender muzzle and short legs like a Dachshund. C/Y might be a Bulldog, while B/Z would be more like a Labrador. “This mixing and matching of chunks of DNA is how breeders were able to come up with so many different breeds in a relatively short amount of time,” writes Stanford’s Krista Conger. Fascinating findings and because complex traits in humans are more difficult to discern, their work with dogs has implications for human health as well.
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