Had to take my albino doberman to the University of Wisconsin Vet Clinic; they did a skin allergy test; got tested for 75 different things; found out that he is allergic to mold, dust, walnut trees, pine, red clover pollen, mulberry. He is now on allergy injections for his allergies; he has prescription dog food which is salmon and potatoes; instead of giving him benadryl for his allegies he is now taking Hydroxyzine twice a day; he is also on Cepholexin for his skin infection; and is using artificial tears ointment for his eyes. All in all, he is doing much better. I also ordered him a pair of doggie goggles for when he goes outside to protect his eyes since he is an albino dog.
My doberman has the same problem and we have gone through the same tests and found nothing. Have you found out what the problem is yet? We are desperate to help him and the prednisone makes him fat/sleepy.