If you're a dog owner, you're likely familiar with the tail wag of your furry companion when you come home from work or when your dog spots another animal companion. While tail wagging is most ...

An curved arrow pointing right. A dog chasing its tail may be a sign of a direr issue. Like humans, dogs can suffer from a form of obsessive-compulsive disorder, called canine compulsive disorder.

“Dogs are incredibly expressive animals, and they show emotion in a variety of ways,” Dr. Dulake says. “Tail wagging is the classic sign—when a dog’s tail wags in wide, happy ...