Is your dog barking excessively, whining and hiding? These behaviors are likely caused by fear and anxiety. ADAPTIL is a clinically proven, drug-free solution that helps your dog feel calmer. ADAPTIL Calm Home Diffuser Refill provides ?comforting messages? (dog appeasing pheromones) that helps dogs feel calm and relaxed in situations like loud noises (thunderstorms and fireworks), staying home alone, or other fearful situations. These odorless messages are only perceived by dogs and provide a strong signal of security and comfort. Cats and people are not affected. ADAPTIL Calm Refill vials include one refill vial (diffuser head sold separately). Plug in diffuser where your dog spends the most time. Should be used continuously for at least 30 days. Covers an area up to 700 sq. ft. It is recommended to replace the refill every 4 weeks, even if a small amount of liquid remains in the vial (the vial will never be completely empty). #1 brand used and recommended by veterinarians. Clinically proven to work. Drug-free solution that helps reduce signs of fear and anxiety, like whining, hiding and excessive barking. Provides your dog with continuous and constant comfort. Refill includes one refill vial that lasts up to 30 days (diffuser head not included, sold separately). 100% satisfaction guarantee.