Why Is My Dog Chewing His Tail. The pain can be due to: Full or infected anal glands, intestinal parasites, skin infections, allergies, perianal fistulas or masses, foreign material, trauma, etc.,” dr.
If they do this chronically with loss of hair you have to figure out the cause before it gets so bad it could lead to open sores. There are several potential reasons for your dog biting his tail. In some dogs, a hormonal imbalance can lead to them biting their tail.