My 2 year old male loves to eat so he's not a picky eater at all, but he cant stomach a lot of foods. His poop is best on pro plan sport dog 30/20, but it makes him smell really bad even after baths. Ive switched from wellness simple, the vet brand, merrick, and grain free proplan. Im not too sure on trying too many different dog foods, but any suggestions to a sensitive stomach dog to make his poop firm and make him smell better? Thanks!