C.C.'s Mom, I am certainly not an expert on this subject, but does your kitty become hungry and then still not eat anything? I had a maine coon cat many years ago, and he would not eat any kind of canned or dry cat food except canned liver. But when he was really hungry he would eat most anything including whatever he could catch outside. Have you tried giving him some fish, say, tuna or some other canned cat food, something that you know he really likes? Could it be that he is not hungry because of not feeling well inside?