I can certainly understand how frustrated you must be. I used to have a cat that was a sprayer, and it was simply a behavioral problem that developed after he was declawed. I tell you what, my husband at the time and I had no idea what declawing was really about and it was just what everyone did when their kitties were neutered. Boy, did we ever learn from that experience! Seems like his problems were a direct result of the declaw, and we could never overcome them. We tried everything (including kitty prozac) and finally, we had to opt for keeping him confined when we couldn't watch him. I always felt so bad about leaving him in such small quarters while my husband and I were at work, but the vet said that it wasn't a problem since cats sleep at least 18 hours a day anyway. Is Irwin declawed by chance? If not, have you ever considered making him an outdoor kitty? I know that's not ideal, but it would probably be better than being PTS...depending on where you live.