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Deciphering (Ab)Normal Dog Behaviors

Chasing their tails, eating grass and rolling in garbage—should you worry?
By Shea Cox DVM, CVPP, CHPV, February 2012, Updated October 2021
dogs are weird

From humping to “targeted” sniffing, our pups have a plethora of odd habits—at least to those of us who walk on two legs instead of four. While no one knows for certain the exact “why” behind these behaviors, we do have some theories. And until dogs learn to speak human, divulging their best-kept secrets, we’ll just have to continue to make educated guesses about this weird-but-true realm of doggy deeds. The key is recognizing if a behavior signals poor health.


When puppies chase their tails, it’s like babies grabbing their toes—and this is a normal way for them to explore their bodies. But like anything in life, moderation is key, and problems can arise if this behavior becomes compulsive. So, how do you determine if your pooch has a case of Canine Compulsive Disorder? It comes down to whether you can distract them from this behavior. If your dog would rather chase her tail than go for a walk, she may have a compulsive disorder and veterinary assessment may be needed.



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It can be common for dogs to drag their bottoms across the ground after doing their business, particularly if their stool is loose. But if this behavior is noted frequently throughout the day, this may be a sign of impacted anal glands, a condition that can have serious complications if left untreated.


Watching your dog get personal with his stuffed toy can make you want to look away, but it’s not abnormal. Many dogs discover that humping feels good, it can relieve stress or serve as an outlet for excessive feelings of exuberance and excitement. Both males and females are known to partake in this behavior, though males do it more often.

Eating grass

People often think that dogs eat grass when their stomachs are upset or they are ill. However, a good ol’ lawn actually serves as a gourmet snack to many dogs. As omnivores, they like to eat their meat and veggies, too. Eating grass in moderation is a normal part of a dog diet, and a walk in the park for my dogs always includes a stop at the grass buffet. That said, if all of a sudden you see your dog frantically binging on grass, this could be the sign of distress, and a call to your veterinarian is in order.


It is general custom for Spot to greet Rover with a sniff of the behind, but why share this custom with us? Bad manners? Well, not according to the canine code of conduct, as this is a perfectly acceptable way of collecting personal information about one another, including humans. So the next time you are surprised by a nosey nudge, just know that you are being greeted and assessed (and don’t worry, dogs generally won’t be offended if you just give them a pat on the head in turn).

Eating excrement

Gross, right!? I’m asked about this all of the time and all I can do is give an empathetic cringe of the nose and a shrug of the shoulders. (I know the score: My dog Mickey used to raid the cat’s litter box, proudly returning with “kitty cigars.”) As stomach-turning as this is, eating excrement is a surprisingly normal behavior for dogs. In the early stages of domestication, dogs performed a hygienic function of cleaning up their own feces. Additionally, their digestive system is very efficient and they can actually get some quality nutrients out of it—although I can think of much better sources.

Rolling in garbage

When we see a decaying animal or a pile of garbage, our first inclination is to step around it … waaaaay around it. But, keeping true to our dog’s oddities, it is their greatest desire to jump right in, getting a good coating of ick with a strategic roll. The more foul the smell, the stronger the lure, and the more joy that is experienced by our now perfumed pups. One theory is that dogs like to cover their own scent with horrible odors to make it easier to surprise prey. You probably can’t curb your dog of this desire, so your best hope is to spot smelly things first and steer your pal in a different direction.

I hope this has shed some light on a few odd dog behaviors. Funny, as I sit here, I find myself looking over to my own dog, Bauer, wondering if he is looking back at me thinking, “Wow, there she goes again, sitting in front of that computer when she could be outside playing with her ball. Now, that’s just weird.”

Image: angel1238812 / Pixabay

Dr. Shea Cox is the founder of BluePearl Pet Hospice and is a global leader in animal hospice and palliative care. With a focus on technology, innovation and education, her efforts are changing the end-of-life landscape in veterinary medicine.