OK, from all the responses to the question, I think everyone can see it can be lots of causes and different ways to treat it. THAT is why a vet visit is so important to rule out some of the causes and get down to the itty gritty to help this little ferret or any other with this problem. As I previously said even a vet can't guess without seeing the patient as to what is wrong. If you know the cause there are several things you can do (by the way with IBS, we found Totally Ferret Venison really helps on that chicken allergy thing) Diarrhea is a killer in ferrets if let go over a long continuous time, it is robbing the ferret of the things it needs and causing the organs to function at half mask, not enough hydration to work well. I would urge you to find the basis of the problem and then see how everyone treats that cause if you feel your vet is not knowledgeable enough to make a difference on treatment. Millie Sanders at Txferretrescue.org with Texas Ferret Lovers Rescue and connecting Foster homes and sanctuaries [Posted in FML 8082]