ThunderEase Calming Collar for Dogs mimics the calming pheromone that a mother dog releases while nursing her puppies, which helps your dog to feel calmer, more secure and more comfortable. Your dog's body heat activates the calming pheromones in the ThunderEase Calming Collar, so they are there to help calm your dog wherever they go, and in whatever situation that comes up.

• Size Large is 14-24”
• Trim to fit
• Provides calming relief to a variety of stressful situations
• Activated by your dog’s body heat
• Lasts up to 4 weeks