My dog has those exact symptoms with a food he can’t tolerate and he also has environmental issues. We’ve had luck with Petcurean’s Go! Sensitivity + Shine Limited Ingredient Diets. He specifically does well on the duck but I know they have salmon, turkey, duck, and venison formulas in their limited ingredient line. It doesn’t have potatoes but does have peas/lentils. If you aren’t certain that peas are a problem, I would recommend giving it a try! The Honest Kitchen Zeal is fish and sweet potatoes, so that might work for him. Finding a dry dog food that only has sweet potatoes as the binder in the kibble is difficult. Have you considered trying a commercial raw food?
