The PetSafe KeepSafe Break-Away Safety Collar is designed to prevent your dog from getting entangled by their collar. If your dog's collar gets stuck on something and starts to choke, the patented break-away safety buckle releases and the break-away safety collar falls off harmlessly. This safety collar also comes with a durable nylon webbing collar and DuPont nylon polymer buckle. Patented break-away safety buckle ensures your dog's safety Buckle designed to release due to pressure from various directions Can be used as a secure walking collar by attaching leash to the 2 D-rings Safety collar with durable nylon webbing collar and DuPont nylon polymer buckle Petite collar fits neck sizes 7 in. to 10 in.; small collar fits neck sizes 10 in. to 14 in.; medium collar fits neck sizes 14 in. to 20 in.; Large collar fits neck sizes 18 in. to 20 in.; extra Large collar fits neck sizes 22 in. to 34 in. 1 year limited warranty Note: This product may require up to 2 additional days for order processing prior to shipping