Thanks for the thoughts on Nutri-Cal--I checked in with the vet today, and he said it was fine to try it out. So far, Charlie's had full bloodwork, x-rays and an abdominal ultrasound, and they haven't found anything. The cat sitter says she fed him as we told her to, and that everything seemed fine. He's always been a light and picky eater, so getting him to eat now, when his appetite is basically gone, is just not working out. It makes me so sad, seeing his little body so thin. We're going to give him his second appetite stimulant soon, and maybe that will work--he did show some interest in his food, but he's only eating a few dry pellets here and there, not enough to put on any weight.

I just wish he would eat....