I give Koa a teaspoon of fat free flain yogurt with each meal. It has helped tremendously with his gas (not to say he doesn't fart anymore, but less frequency). I took him off the yogurt for 1 week to see if I could notice a difference... OH BOY! Let's just say he's back to getting yogurt!!!
Plain unsweetened natural yogurt with live cultures helps in keeping the good bugs going in the digestive tract. We don't give daily, but we do give a few times a week. You might change their diet as well. Some foods are more Tootie! We feed Raw, and have little gas issues until we introduce outside items like some traets and too much dairy. Just a change in kibble may help.