ADAPTIL® Collars offer up to 4 weeks of continuous calming and comfort indoors or outdoors. Large collars measure 70cm (27.6in) long and are designed to fit necks up to 62.5cm (24.6in). Use an ADAPTIL® Collar to help puppies and adult dogs feel more confident during socialization, focused during training and comforted while boarding or experiencing new situations. ADAPTIL® is a synthetic copy of the natural appeasing pheromone mother dogs emit to comfort and reassure their puppies. It is clinically proven to help increase focus during training and reduce stress in puppies and adult dogs that can lead to unwanted behaviours.