Marking and Spraying Scent marking is done most often by adult male cats but female cats can do it also. This is different from elimination because it is done to mark territory. Scent markings are generally done on vertical surfaces such as walls. Popular areas to mark outside include bushes and fences. Several cats can traverse the same territory at different times marking the same areas over and over again.
Marking appears to be time related.
As the scent wears off, the cat comes back to mark it again. An indoor cat that sees another cat outside the patio door, may mark inside. Bringing the scent of another cat in on your shoes or clothing can have a similar effect. Marking can be a sign of stress. In multiple cat households, overcrowding can lead to urination problems.