Young Dog Biting Tail. And yes, this means there might be a possibility that your puppy may be chewing their tail due to a parasitic infection. This behavior tends to gradually diminish and disappear as the puppy reaches adulthood.

Your dog may occasionally think of it as a convenient chew toy. When your pooch bites at his tail, he risks opening the skin. Some dogs are allergic to the saliva of fleas and ticks.