Lost hair, Now digestive problems
I have a 9 yr old GSD male. About 3 years ago he started losing his fur. I've had him to about 7 vets, 2 of them were dermotologists. Since he was about 4 yrs old, he started having problems with allergies and ear infections. The vets said he had flea dermititis even though he was on flea meds. I bathed him with special shampoo (no help), he's been checked for mange and has had blood tests. All negative.His current vet says he has food allergies. He is now eating For Health Chicken & Rice formula. He no longer has ear infections. He only has fur on his head, neck, legs and tail. In the winter he wears a sweat shirt to keep warm. This past summer he started to strain when he pooped and the problem continues. His stool looks ok, except when he eats something other than his regular dog food, but he continually strains like something is stuck. Finally 1 or 2 little pieces are eliminated and then he's ok. Lately he's been having bouts of diahrea when he eats something other than his dry food. I gave him a tiny amount of sweet potato last evening and during the night he had gas and diarrhea.
I want to try him on the BARF diet, but am concerned about his food allergies and his reaction to foods other than For Health, (carried by Tractor Supply) It has no wheat, corn, egg, artifical ingredients, etc.
Any help or ideas of what could be his problem(s) would be greatly appreciated.