Nurture Calm 24/7 Canine Pheromone Collar is a calming synthetic mammal pheromone collar that helps dogs in fearful or stressful situations (separation anxiety, fireworks, thunderstorms, visitors, new puppies, new baby, vet visits, travelling). Nurture Calm 24/7 Canine Pheromone Collar is activated by means of the body temperature of the dog, it goes where the dog goes, whether it is at home or on the go. Nurture Calm 24/7 Canine Pheromone Collar lasts for 30 days. It mimics the pheromone that the bitch produces to calm and reassure her puppies. Dogs recognise these pheromones throughout life. It mimics the natural way to help dogs cope with new and fearful situations.