The Adaptil Junior Calming Dog Collar is an easy to use, adjustable collar that helps to comfort newly adopted puppies and facilitate their integration into the family household.The Adaptil Junior Calming Collar releases 'comforting messages' identical to the ones sent by the mother dog to naturally calm and reassure her puppies (Dog Appeasing Pheromone) and is activated by body heat. The translucent blue collar fits necks up to 37.5cm in circumference, releases the pheromone over 4 weeks and should be worn continuously.ADAPTIL Junior is a great answer to comfort recently adopted puppies and help to make their education simpler. During adoption, ADAPTIL Junior helps in many situations such as: preventing crying during the night, support for when staying home alone, loud noises, or puppy car travel. During training, ADAPTIL Junior improves learning: toilet training, leash walking, socialization etc. Clinically proven and veterinary recommended.Key Benefits Helps puppies learn quicker