Good lateral thinking, ciarali. Or is the word cateral in this case?

But "the ultimate solution is for cat owners to control their pets." You can't control cats except within very strict limitations. (Leaving aside those vicious bastards who do things like de-claw their pets - any vet who did that here would be catfood if the news leaked out.)

We once had a visiting cat who used to wait till the door was open, and he'd sneak in and use our cats' litter tray. I've never known another cat with that kind of toilet training!