We had a new carpet fitted on our landing and stairs 3 months ago and I am at my wits end with the cat peeing on it. She is an 8 year old cat and has always used her litter tray with no issues. Since having the new carpet fitted she pee'd on it. I read somewhere that underlay has a smell to it which cat's like to pee on to cover or that they think this is where they go. I have scrubbed every time I have caught her but cannot say I have caught every area. I am using enzymes cleaner but she still uses spots all along the landing. I cannot shut her off from this area as she used the landing to go from room to room and the bathroom where the litter tray is. she lives upstairs mostly as the dog is downstairs and she hasn't found her big girl pants yet! The litter tray is scooped every day and cleaned once a week. This weekend I scrubbed the carpet top to bottom and put tin foil along the side she pees on as I read they don't like this, but with enough space for her to walk through. The foil has worked but one little spot I left uncovered by my bedroom door she pee'd on! She will go to the litter tray to do no.2 but pee's on carpet. She has no bladder infection or illness as she has been checked by vets. please help!!!!