Have you considered a raw diet?
I would definitely vet first, though. When you're considering it, the symptoms probably warrant it. Make an appointment
I, personally, probably wouldn't mention PMR (prey model raw) to the vet, though. They're not usually fans. Might put you through several months of a science diet first. Some, not all vets. There are many good threads in the forum, lots of success stories with skin issues resolved with a raw diet. And just as many, or more, science diet reviews.
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