SENTRY GOOD Behavior Calming Drops include a pheromone that helps calm a dog in stressful situations. The calming drops contain pheromone technology that mimics a pheromone that the mother dog produces. Dogs associate this with the reassuring feeling they had as a puppy when around their mother. Dogs recognize these pheromones throughout life. This takes advantage of the natural process of association and nurtures a calming effect.