Someone was angry

1 - This is the door to my home office and storage. This is where I keep his carrier. This door is not to the outside world. 2 - We took him out of the house the night before and he was hanging out with other people for about 5 hours. 3 - He peed in his carrier which is stored in this room from the day before (read #2) and I did not notice 4 - He thought there was another animal in there because he smelled his pee through the door. He marked the door and really wanted into the room. 5 - The reason I spray