Thanks for the suggestions, all. We've tried a gazillion different foods to see if we can find something that piques his interest, but no luck. Charlie has never been a big eater and is VERY picky. So, we're syringing him with Hills a/d these days. I think I'm going to talk to my vet about putting him on prednisone--it might stimulate his appetite, and if this is IBD, it might soothe his tummy. I'm sort of relieved to hear that Mr. Meow was syringe fed for three weeks and then did start eating. I was starting to feel very pessimistic about the possibility that he'd ever eat on his own again, but we'll keep trying.