Hi,
Am I to understand that you are opposed to home-cooking?
I believe that the best diet for any sensitive dog (food or otherwise) is a well-balanced home-cooked meal. Just too hard to avoid "extras" in kibbles...much easier to maintain control of what is in the food when you make it yourself.
However; if you would prefer a kibble, I suggest you try this website to help you decide.
Dog Food Analysis - Reviews of kibble
Happy researching