CEVA Animal Health ADAPTIL Calm Home Diffuser Refill for Dogs #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.