Our dog had horrible allergies and dermatitis - to the point that her skin reddened and blackened - and was diagnosed with a grain allergy, as well as allergies to most grasses and trees. Yes, I'm that guy who takes his dog to the allergist for skin scratch testing. Since she's a chihuahua-Pekingese mix, they had to shave about half of her left side to get enough skin surface area for testing ...
Since we switched to grain-free food years ago, her allergies are significantly better. We get
Taste of the Wild Salmon flavored dry food for her at our local Tractor Supply Store. It has a such a strong odor that we had to invest in a large sealing plastic bin to keep it in.
TSC also carries the Blue line of products, which I notice are 34% protein vs the 25% in Taste of the Wild.
It was tough to find grain-free snacks that we can hide her Benadryl in. We've settled on Pupperoni.
Cool thread, and let me add my best wishes for your business!