he isn't neutered, I really didn't want to chop him. The vet I spoke to said it probably wouldn't help with the marking thing. I think I will try it anyway. To the other posters its definitely not a potty training thing, he gets out plenty and will whine at the door if he needs to go and we haven't let him out. May try one of those belly band things if the neutering doesn't work. I really dont want to get rid of him I am just beyond frustrated with this problem, its freakin disgusting (the marking pee seems to be extra strong) and I know by his immediate behavior when we go upstairs that he knows he is not supposed to do it.