SentryHC Good Behavior Calming Pheromone Collar for cats mimics the pheromone that the mother cat produces to calm and assure her kittens. A convenient alternative to pheromone diffusers - the collar goes where your cat goes! Recommended for Separation Anxiety, Excessive Meowing, Destructive Behavior, and Inappropriate Marking. Breakaway collar.Lavender Chamomile Fragrance. For cats and kittens - Up to 15" Neck.