My dog has multiple food sensitivities too and I went to chewy.com and spent an entire afternoon reading the ingredients lists of every food they sell. They do have the ability to put a couple limits on your search and I told it to order them from most expensive to least expensive because I know with grain sensitivities all the cheap foods are right out. I made a list of every possible food and then started ordering small bags of all of them and used them one at a time to test. I took notes on how he did on every one. Now, I have a list of foods he can rotate though.
