Norm is gassy but it's usually not too bad. I feed him the brand my pet store puts out (I believe it's Fromm) I give him Charlee Bear treats( (Liver Flavor) or plain brown bones they don't make him gassy and he loves them. Every once in a while I will give him something else or I'll drop something and he eats it before I can get it and then he will get really gassy. If he does get really gassy I have treats for gas that I got at a local pet store or I give him some plain yogurt. He also has a slow bowl so he doesn't inhale his whole meal in seconds.
Winston gets gassy, when he does we give him a charcoal biscuit.