Tail-chasing is fairly common for puppies — they might treat their tails like just another toy. An adult dog who often bites or chases their tail may be bored or in pain, or have worms or fleas.
Stud tail in dogs is a skin condition that affects the sebaceous gland at the base of a dog’s tail. Also referred to as supracaudal gland hyperplasia or tail gland hyperplasia, it is similar to acne ...