I have a russian blue that is 3 yrs old. He normally pees in the litterbox, but for some strange reason usually once a day he will pee in the bathtub. I think he purposly waits for the alarm to go off in the morning and then runs and pees just to piss my fiance off before he takes a shower. How can I get him to stop short of closing the bathroom door? We live in an old bldg. and it gets too cold to keep the door closed.