Thunderease calming collar size L (Derwood, MD)

ThunderEase Calming Collar with Adaptil Calming Pheromones, size Large for dogs with up to 24” neck; for help with thunder, fireworks, separation anxiety, and visitors (but wear 24/7 for maximum benefit); lasts up to 4 weeks (see product link below). https://www.petsmart.com/dog/health-and-wellness/anxiety-and-calming-care/thunderease-dog-calming-collar-stress-and-anxiety-relief-calming-pheromones-small-large-1-count-68767.html