Sentry Good Behavior Pheromone Calming Collar for Cats, Standard Size Sentry Calming Collars use Good Behavior pheromone technology. Using a pheromone that mimics the one mother cats produce to calm their kittens, the collars are clinically proven to reduce or eliminate stress-related behavior such is inappropriate marking, destructive behavior, clawing and anti-social behavior. Collars help alleviate problem behaviors triggered by travel, thunderstorms, fireworks, being left alone and new social situations. This collar continues to release calming pheromones for CAT CALMING COLLARS SENTRY CALMING COLLAR FOR CATS , EA