I figured I would ask this here:
Over the last couple of weeks I noticed the older of my two cats (he's a little over 4 years old) was having diarrhea in the litter box. I saw him actually doing it, and got a vet appointment as soon as I could. Vet felt him and everything, and asked questions, and they decided to put him on a bland food diet for now, with probiotic powder to put with his dinner. They also gave him an antibiotic. For the antibiotic, at first he would take the pill with his food, then he got smart and wouldn't eat the pill. We had to keep coming up with new methods to get him the pill until we finished his last one this morning. He'll still be on the bland food and probiotic though.
However I notice still his stool is kind of soft. It isn't pure liquid, at least not that I have seen, but it still concerns me. He's a long hair cat, and it occasionally drips right outside the litter box when he's done. While it's technically an improvement, I am concerned that it's not much of one. I got a sample and gave it to the vet, they tested it for all the stuff they usually test it for and it was negative. I talked to the vet and he said basically I should watch him over the next week and see how he does. After that the options are a steroid to see if that takes care of it, an ultrasound on his intestines, or a different diet. He didn't seem that concerned about it though.
Should I be worried? He's not vomiting other than an occasional hairball every couple of months. He also acts perfectly normal otherwise, and I wouldn't have known something was wrong other than seeing him have diarrhea. He plays and snuggles like he always has.