I have a mate with a sheppard that had severe IBS. In hospital a few times so a little worse than most. But She was on a digestive powder, Natural Aniaml Solutions with a probiotic. Ultrabiotic 45, I think it is made by Bioceuticals. Have to get it from a health food store that has a naturopath. Stopped the runs straght away. She also changed her dog to a natural raw diet. Not sure of the rest of the details as she was being treated by this animal naturopath. All I know is the dog is doing really well now.