Gator has had very bad diarrhea for a long time which has caused him to drop half his weight. He nows weighs 27 pounds. He is on panacur and albon. He has been on this medicine for a week. And his stool is starting to get a lil bit better. But i cant seem to get him to gain any weight. Is there something i can add to his food that wouldnt hurt his stomach but would help him gain weight?