thanks for link to your dog food. Lol, many of us here are a bit into dog nutrition!!
EDIT: i see that CharmedWolf
has posted at same time i was typing up my reply, and she is great resource on dog nutrtion!! I'm so glad she spotted this thread.
She is not a vet, so far as i know, but, i have learned SO MUCH from her advice.
i see there are TONS of various recipes on your link, Catherine, not sure which recipe YOU feed, or maybe you use them all.
Almost every one of those on that site are not very good choices on that page. Not the worst in the world, either, but, for the price, you could get a lot better, more nutritious dog food than those dog foods. (i'm not judging, i once fed my dog the worst dog food in the world, but, i just did not know any better back then.)
You say you feed the "grain free" dog food? right
That one is not as bad as some of the other dog foods on that page, the "Sans Grain" recipe is probably the best recipe on that whole page, but,
you could probably do a lil better. especially for what you are paying for it cuz you love your dog so much.
It does contain Menodione, which is a form of Vitamin K, but, is toxic to dogs. It is banned from human food. <---- this might not have ANYTHING to do with your dog's rash, though. But, for the price you pay for that dog food, for your beloved dog, you could probably do better.
some sources say Vitamin K can cause skin problems:
http://www.dogfoodproject.com/index.php?page=menadione
^which is NOT to say that IS causing
YOUR dog's skin problems, though....
I can't find a professional nutritional anaylsis of that recipe of that dog food, but i can recognize some ingredients in it, and most are fine, i do not see any
obvious allergens, except for Vitamin K,
and i would rather it says "chicken liver" than "chickn liver
digest" as that can be reallly low quality ingredient,
and i do not know about the 'fermentation' products in it.....
but, there are so so so many ingredients in it i do not know what they are. I can find analysis of all their
other flavors of dog food, but not the "Sans Grain" recipe.
Oddly, i have heard of dogs, especially
white pure bred dogs, who can actually develop allergies to chicken itself!!!
, or dogs who develop some allergy to some other meat. Weird idea
to me, a dog allergic to meat. But, apparently it can happen!!
Maybe, if the vet's antibiotics do not clear up these sores,
maybe, maybe, maybe, you *might* want to consider putting dog on bland diet for a few days, (like plain rice with a few scraps of chicken in it) and see if that makes a difference?
or try plain rice with maybe lamb in it? for a few days, see if that makes any difference..
(it might not make ANY difference, but, you could maybe maybe begin to assess if your dog has developed an allergy to something in his dog food...)
at any rate, i sure do wish you the very best of luck in solving your dog's skin problems!!