The bad news is that he's probably got allergies. Or scabies...
Scabies is very contagious and the other dogs have no symptoms, so I kind of doubt that it's that.
In my experience, usually if one dog has it, so does everyone else in the house, including you.
They sent us home w/Cephalexin, Prednisone, and a medicated shampoo. He also needs to take Benadryl twice a day, and I made an appointment for allergy testing.
You may notice he's peeing/drinking and eating a lot more on the prednisone. Those are fairly common side effects. Mac cannot take pred because he pees all OVER the house and it also makes his aggressive tendencies much worse -- that is an UNcommon side effect.
The vet wants me to take Faust off the raw diet, and try him on a kibble w/venison, duck or rabbit. I'm not happy about it, but IF he turns out to be allergic to chicken, beef, or eggs... it would make sense.
We went through every protein in the book with Mac and he seems to do best on pheasant (we feed Evangers Pheasant and Brown Rice kibble). He also does okay with venison and rabbit. Food trials are a pain in the ass and can be very drawn-out and complicated because the results do NOT show up immediately unless the dog has a severe reaction.
What you want to look for is a kibble with only one protein source and one major carb -- such as a duck and potato food, or rabbit and rice. Wellness makes a couple of different allergy formulas as do other companies.
Definitely stop all treats and rawhides, especially chewy treats -- all the preservatives tend to make allergies worse in my experience. If you want to give treats, use apples or carrots or green beans, etc. Mac loves lettuce.
But, you may
want to wait to do food trials until AFTER the allergy test results are back. If he's allergic to environmental stuff, then the food might not make much of a difference (as far as allergies go). While Mac does have sensitivities to some foods, his major allergens are dust/storage mites and molds. Once we got *that* part of his allergies under control with allergy shots, his food sensitivities dropped drastically. He used to not be able to eat beef at all without developing HUGE hives and now he can have it in small amounts with no side effects.
What kind of allergy testing are you doing -- blood testing or all-out testing at an allergist?
Never make someone a priority in your life when that someone treats you like an option.