Barely used once. Follow hypnotic dog co’s measuring guidelines at the widest part of your pet’s head. I would have preferred a much larger one for my dog even so. 18” size. “Pop the Bubbly” color pattern. Use at your own risk. These are designed to be unbreakable and used only with supervision. See website below. Collar-style slip-on necklace (not a collar) $48 new plus shipping https://hypnoticdog.co https://hypnoticdog.co/pages/product-info https://hypnoticdog.co/pages/size-guide