This was the shelter vet?The vet did say some worrying things. She mentioned FIP, although he has no symptoms.
If I were a betting man, I'd go with a relapse of giardia plus maybe roundworms or tapeworms, although we've seen no signs of the tape worms, except Flambe scooting on the carpet.
EDIT: The vet also mentioned cardiomyopathy, but, again, no real symptoms of it.
You know Mike...... :stomp: FIP unfortunately is thrown out there just like that - don't know what's going on...... "oh, can be FIP" :wife:
Flambe has no symptoms and is not a kitten nor a senior..... :doh3:
Sorry Mike....... with those 2 "diagnostics (or lack-thereof) I would be going to another vet....... :2cts: