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SENTRY Calming Collars use patented GOOD Behavior pheromone technology. It uses a pheromone that mimics the one mother dogs produce to calm their puppies. Collars help alleviate problem behaviors triggered by travel, thunderstorms, fireworks, being left alone and new social situations. This collar continues to release calming pheromones for your dog for 30 days. It can be used for dogs of all ages and breeds without long-term side effects.