Yep, same issue here. Our 2 1/2 year old Harley started marking about 7-8 months ago for no apparent reason. He marks the cats scratching post, chair legs and the legs of our bed. He has absolutely ruined the carpet in our bedroom because of this. He even pees on the siding of the house on our deck
He wears bellybands all the time now. Nothing I have tried helps with this issue.