Winston is on Blue Buffalo's sensitive stomach food. He does well on it, but I was thinking about switching him to Fromm since I finally found a place that sells it! Fromm is such a great food, but I'd have to find sensitive stomach stuff for Winston since he's just a natural room-clearer with his gas. I swear we could bottle it & sell it to the government as biological weaponry.
Yogurt and Kefir help with gas as well.