[anonymous]

“I have no access to an animal dermatolist unless I want to drive 4 hours”.

Not true. You don’t want to go to one, so be it.

But they are everywhere. Just ask your vet for a referral.

https://www.acvd.org/tools/locator/locator.asp?ids=16_Find_Dermatologist

PS: I have no food recommendations as food has NO effect on environmental allergies.
You may be trying to treat the symptoms, GI distress is a symptom of untreated environmental allergies.
The immune system breaks down and the dog is vulnerable to all kinds of stuff.