Dog losing hair on tail, or caudal alopecia, is a common condition in dogs where there is hair loss on the tail. This can be caused by a variety of factors, including allergies, hormonal imbalances, and skin infections.
Losing hair on the tail can be a sign of a more serious underlying condition, so its important to take your dog to the vet if you notice this symptom. Treatment for caudal alopecia will depend on the underlying cause.