Hair loss on the tail can be a tell-tale sign of Cushing’s disease. Other signs of Cushing’s disease include drinking more water, increase in appetite, and a pot-bellied appearance.
Cushing’s disease is diagnosed by a blood test that is quite accurate. Several treatment options involve different medications.
Hair loss anywhere on your dog’s body could also be from parasites,an infection, allergies, or an overactive immune system. Get it checked out by a vet as soon as you can so it does not develop into anything more serious.