How spoiled is my cat?

I have been worried about Rusty because he stopped eating and has lost a lot of weight. (He needed to lose weight, so at least there was a good side to this story!) He has IBS and food allergies, so he is on a special diet and has enjoyed the food so far. The vet orders the food and he always liked Salmon & Green pea best, so thats what I have them order. It comes in a case, so he's had the same kind for a while.

A few weeks ago, he started leaving his food on the plate. I'd leave him all night and come back to find that his food is still there. I had to stay with him and pet him, stick the food in his face and coax him to eat. I had decided he was sick--went to Petco to get more food and bought a variety of canned food that is okay for him to eat and had planned to take him to the vet. But I just wasn't sure what was going on--he plays, purrs when you pet him, would even eat some samples of dry food that I picked up at the local pet store. I came home with the food yesterday and of course some of his salmon & green pea was still on the plate. I give him 1/2 can at a time and he never eats the whole thing. Yesterday evening I opened a new can of Venison & green pea and he ate A WHOLE CAN in no time! He just did the same thing this morning, so I now have a diagnosis....SPOILED ROTTEN!!! Ha ha!! AT least he's not sick!