It could be a food intolerance to many different things, Kathleen. Mine reacts the same way to fish (including fish oil), which frequently pops up down the list of ingredients in foods that are other protein based. My friend’s dog reacts the same way to tomatoes. You never know.
I’d suggest closely comparing ingredient panels to help you identify problem ingredients. It can take a while, but his problem ingredients will eventually become evident.
I’d be inclined to try a limited ingredient food for a while to see what happens. If you like NVI, maybe consider their LID’s. My dog with intolerance issues does very well on it. It’s single protein, tapioca, peas and no other fruits or veggies. I just don’t recommend the lamb formula any longer as a recent recipe change significantly reduced the protein and fat and increased the pea protein. Be sure to closely monitor portion size and keep track of treats and toppers, whether canned or fresh, whole foods.
