my 3 yr old fox terrier losing all her hair....
Hi May
There are all sorts of health problems and conditions that can cause hair loss in dogs. Canine allergies and Mange is just a couple of them.
I can only recommend that you take your dog to your veterinarian as soon as possible so that he can make an accurate diagnosis.
That way you'll be able to get your dog the right treatment so that he can recover. Best of luck, hope he's doing much better soon.