Sentry Calming Collar for Dogs Includes calcium and phosphorus for

Includes calcium and phosphorus for proper bone developement

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Sentry Calming Collar for Dogs Includes calcium and phosphorus forSentry Calming Collar for Dogs. Sentry Calming Collars use patented Good Behavior pheromone technology which mimics the pheromone which mother dogs produce to calm their puppies. The collars are clinically proven to reduce or eliminate stress related behavior such as inappropriate marking, excessive barking and chewing. Collars also help alleviate problem behaviors triggered by travel, thunderstorms, fireworks and new social situations. The collar