The Adaptil collar continuously releases Adaptils dog appeasing pheromone to promote feelings of calm and well-being in your dog or puppy. Adaptil is an odourless, man-made version of Dog Appeasing Pheromone (DAP). Female dogs release DAP soon after birth to establish feelings of well-being and attachment in their puppies. When used correctly Adaptil can promote these feelings in your dog or puppy to help them overcome anxiety and other behavioural problems.