Hello all I'm in need of some help. After being the best and cleanest boy since he arrived Elton has suddenly started peeing on one particular cushion on our sofa. It's not a health problem ( had a urine test cleared by the vet) it's behavioural and I just don't know what to do. We have had the sofa deep cleaned, use enzyme sprays and I've also got puppy pads and covers down and moved his litter so it's next to the sofa but no dice. I suspect it's marking behaviour as he does one pee on it a day ( the rest of the time he either uses the litter or goes outside) and tends to do it in the middle of the night when he won't be disturbed. If I do catch him at it he hops off and pees normally in the litter. We are at our wits end so if anyone has any ideas please share - cat tax attached