You should avoid giving heavy and rich diet to your pet for a while. Try to give it wet canned food. In order to make its stomach fine again, keeo your dog humgry for 10 hours and then slowly start giving it light food and then move on to rich diet. I recommend you boild rice and chicken. Freez it for 10 hours and meanwhile do not feed it anything. A herbal medicine PetAlive Digestive Support is good to support an upset stomach.