We have an otherwise adorable male cat who, apparently, likes to pee on the floor (rug, bed, etc.) when stressed. He savaged a mattress beyond retrieval, and has been hitting the floor in our closet pretty heavy. We tried EVERYTHING. And then, in desperation, tried this collar. It appears to work. The freelance peeing has stopped. Unfortunately, he also developed a skin reaction to the purple plastic, and his chin completely scabbed up. I removed the collar, and replaced it with a cloth collar which I sprayed with the same compound (pheromone + lavender/chamomile) thinking the milder formula might be better. Sure enough, the cloth collar plus spray works just fine, and the peeing has stopped. The spray is Thunder Spray - sorry Sentry, but I cannot tell a lie, their product is better. Giving 2 stars, because the idea is good, but holding back the additional 3 because your product harmed my cat. Maybe revisit your compound, and/or delivery system, do some more testing. Meanwhile, we're happy with the small fabric collar and the spray.