Q. What causes hair loss on a dogs back
DR. CHRISTIE LONG, D.V.M., C.V.A.
A. Hair loss in dogs can be caused by fleas or other external parasites (like mites, which cause mange), allergies, and hormonal diseases. Knowing more about your pet, such as his lifestyle, age, and environment would help to figure out what's more likely. If he gets a flea prevention product regularly and the skin is normal in appearance other than the hair loss, and he's not itchy, then allergies and parasites are less likely than hormonal diseases, like hypothyroidism. Your vet can help you figure out what's specifically wrong with your dog, and treat appropriately.