Your dog is your best buddy, but does his behavior sometimes have you shaking your head?

For instance, why does your dog like rolling on putrid material like dead animals or rotting garbage? No one knows for sure, but the proffered explanations all point to instinct. Perhaps your dog’s ancestors wore the scent to carry information back to their pack. Or maybe the odor allowed them to mask their own smells while hunting. On the other hand, it may be that your dog is just trying to mark the foreign scent with his own.

And why does your dog eat grass? Again, nobody knows. Dogs are omnivores, so plants can be part of their natural diet. And as predators, your dog’s ancestors hunted and ate herbivores, along with the plant material in their digestive tracts.

Now if you just knew why he chased his tail …