Anne, what does Joe eat? That is where I would look first. I'm in several groups where eliminating inflammatory foods reduced skin issues, in people and some have mentioned their animals. Not knowing what Joe eats, that's where I'm starting. I've heard there is a wholistic vet in Lincoln, but don't know more than that. Myself, I've has good luck with Quercitin, for allergy, but not sure if it's been tried in animals. Might look that up. An all meat diet is the ultimate elimination/anti inflammatory diet. By the way, apples are high in Quercitin, but you can't eat enough apples to reach dose needed, so I buy mine on Amazon, Now brand.
Velda