One of my cats, Purdy, has been put on a special diet food, K/D for his kidney problem. The vet said it was more important that he DID eat than WHAT he ate, so I'd like an idea if he is eating an adequate amount. I've never tried to feed canned food only and in recent years have fed only dried food as the cats seemed to waste so much canned. So about how much canned food would you expect a 13.4 pound cat to eat in a day? One can? More than one can? Less than one can? I don't want to wait until he loses weight before deciding that this isn't working.