Purrley, just curious...Did you ever use Nature's Miracle to remove the urine smell from the carpet? I have used it on all the urine spots more than once but it still smells. I am now faced with either putting in wood floors - a very expensive solution, or putting in new carpet. The only thing is, I don't know if my cat will continue this behavior - he has been sniffing his old spots lately. Anyway, have you had much luck after replacing your carpet?