I have been having problems with my out door cats also with diarrhea. I got some cleared up & used Pepto Bismol but I have one kitten that keeps spreading the diarrhea. Anyhow I think she is the one spreading it. I plan to try yougart on her next. I wonder if there is some kind of bug going around causing the cats to get the diarrhea. Someone dumped off a stray kitten & it started up after she was here. The stray kitten does not have the diarrhea though but maybe she is the carrier that brought the bug here. I plan to call our veterinary tomorrow & see what else we can do. They eat purina dry cat food & don't get table scrapes & clean fresh water everyday.