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 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 Home Diffuser starter kit includes one diffuser head and one refill vial. 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). Diffusers should be replaced every 6 months.