Our 8 year old cat has taken to pooing and peeing on the hall carpet. She has FIV so is kept inside and has a litter tray in the bathroom that she has always happily used. We have sprayed the carpet, sprayed feliway, and yesterday caved and put another litter box there. Which she is now pooing and peeing BESIDE. Our house is starting to stink! She has no other health issues and no changes in her life that may have caused stress.....Getting desperate!