- 1). Catch him in the act of spraying. When a cat sprays, he will back up to a surface-like furniture-hold up his tail and spray urine in several short bursts. Cats who are simply urinating will squat. Observe your cat for this behavior to confirm he is spraying.
- 2). Scan with a black light. Turn off the lights in your room and run a black light around vertical surfaces, such as couches, chairs and blinds.Cat spray will glow under a fluorescent black light. Sprays will show up as a "splat and drip" pattern. Look around the perimeter of the room at about 6 to 12 inches above the floor.
- 3). Use your nose. The smell of cat spray smells terrible. You will likely be able to tell that your cat has sprayed simply by walking into the room.
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