Puppy Bumper - Keep Your Dog on the Safe Side of the Fence - Rainbow Paw Dog's own collar threads through loops to keep it in place Light, comfortable, and machine washable Measure your dog's neck to ensure correct sizing Never fear for your dogs safety near a fence again! "With so many people keeping small dogs in upper-floor apartments, this is one products that really could save a life." ~ Dr Marty Becker, Good Morning America