Poor Tigris.

I've read your post a couple of times to try to understand but are you saying that they vet doesn't know what caused it (ruled out all the other causes) and that the surgery and diet won't help, just a cortisone shot and watching him is all you can do?

Gee, that doesn't offer a whole lot of help, does it? I'm the type who likes nice, neat solutions to take care of things.

Poor boy, please give him scritchies for me and tell him that Jazz sends headbumpies and kitty kisses. We hope he feels better soon.