Tranquil Tails refill pads are designed for use in the Tranquil Tails Waterless Aromatic Pheromone Vaporizer. Designed to soothe anxious pets, these pads when used in the vaporizer disperse a calming blend of essential oils and pheromone isolates. Perfect for easing stress caused by separation, thunderstorms, fireworks, or other stressful times. When your pet is calm, you can relax. Pads are specific to dogs or cats and come in multiple pack sizes and scents. Cat refill pads are available in Vanilla PURR-fection, Peaceful Purr and Woodland Whiskers scents. Pack sizes are 7 or 28. Also available is a 21 pack of pads that includes 7 pads of each scent so you can try them all and choose your favorite!