I would recommend InkedMarie’s sticky post at the top of this page as a starting point. It has a list of grain and potato free foods, then you just have to hunt through a few more ingredients.
My forewarning is that those tests are pretty shifty, and if you took it again, you could get different results. Use it as a guide for trying out some foods, but still keep every ingredient panel and keep a close eye on him, as he could still be reacting to something in the food.
Canned foods tend to have less in them, and dry food cleaning teeth is a myth, so if you’re willing to feed all canned, that’s better anyway
