SENTRY Calming Diffuser for Dogs contains sustained release pheromones that help reduce anxiety in dogs. It is safe to use with dogs of all ages as well as any breed. Its 215 square feet range will help keep your dog calm in situations that otherwise cause him stress, such as fireworks, thunderstorms, or being separated from others. Thanks to the sustained release, the product can last up to 30 days. SENTRY uses sustained release technology to ensure the product works as well on day 30 as it did on day 1. The pheromones used in this product are the same pheromones used by a mother to calm her puppies. Benefits Reduces separation anxiety Reduces negative behavior caused by stress or anxiety 215 square foot range Lasts up to 30 days Can be used on any age and breed of dog