Calming collar-sustained release synthetic pheromones for dogs and puppies. Proven to modify behavior. Recommended for separation anxiety, excessive barking, destructive behavior, inappropriate marking and more. Help your dog in fearful or stressful situations such as thunderstorms, new babies, fireworks, and vet visits. Pheromone collar mimics the pheromone that the mother dog produces to calm and reassure her puppies. Lavender and Chamomile provide soothing fragrance. Lasts up to 30 days.