We switched to a raised bowl and that helped with gas and burping. As others have mentioned, the protein can also contribute to it. Beezy doesn't tolerate beef well and will have terrible gas if we feed it, but she's essentially toot-free on bison, rabbit, and goat. She also gets plain kefir Monday through Saturday and some Bene-Bac on Sunday to help keep her gut flora in check. It's really rare for her to be gassy now. So, a gassy dog is not something you have to live with. Keep a diary of sorts when you're feeding different proteins and see what kind of reactions you get. That'll help you decide what to feed and what to avoid.