Adaptil Calm On The Go Pheromone Small Dog's Collar helps your dog deal with stressful situations, like loud noises, separation anxiety, meeting other dogs and adjusting to a new environment. Adaptil uses synthetic pheromones similar to the ones mother dogs use to calm their puppies. These pheromones promotes wellbeing in your dog or puppy, helping them overcome anxiety Odourless to humans. To use, fit the collar to your dog, then leave it on continuously for a month (except for when your dog is being washed or is taking a swim). Each Adaptil collar lasts around four weeks. Suitable for puppies and adult dogs of any age.