Honestly, there are better foods than Iams. but there also are worse ones. If he's doing well on it, why do you want to switch?
You might want to try a LID (limited ingredient diet). Dick Van Patten's Natural Balance has three flavors in their LID line. I'm sure there are other brands as well. At least with LID, it's a minimum amount of ingredients and that could be helpful in determining what he's allergic to and to eliminate that from his food.
Good luck!
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Tracy, Mom to Izzy and Luna |