There are some excellent commercial foods. Keep in mind that any dog can be sensitive to any food or any ingredient in the food, no matter what the source. Excess gas indicates a sensitivity to the food your dog is eating. Something is not right. If you are going to make your own dogfood, then please do the research as to which nutrients your dog needs. Better yet, look for a good commercial diet. Buy something that is for "sensitive stomach."

My dogs get gas from their food. We feed our dogs blue buffalo which is a very good brand but we noticed certain flavors give them gas. So could be the flavor, also treats can cause gas as well. Sometimes dogs get gas when they need to go to the bathroom, does she get to go outside a lot and do her business?

haha some dogs are just gassy. my dog is always farting. if it seams to be causing her pain, gently massage her stomach and it should relieve some gas.

If she still seams to be in pain call the vet and ask about it

Hard to give an useful answer if you don't tell us what you are feeding it.

bring it to the vet.