A behaviour modification spray to end urine marking safely. If your cat has urine-marked on an indoor surface, use the easy to follow directions to help eliminate your cat’s impulse to re-mark. Works great on indoor plants and Christmas trees too. No Mark! is not a deterrent. However, the simulated pheromones tend to help create a comforting, reassuring feeling in the cat that has a calming effect. Most cats seem to feel less anxious, more content, friendly, gentle, and thus less desirous of re-spraying. The simulated pheromones have no fouls odours and will not affect any surface that water will not harm. Contains no harsh chemicals and is safe to use on almost all fabrics.