Puppy Bumper - Keep Your Dog on the Safe Side of the Fence - Jolly Roger - Fits Up to 10" Light, comfortable, machine washable. Never fear for your dogs safety near a fence again! Slip Collar (not included) through ribbon loops fasten normally around neck secure with snap "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 Measure your dog's neck to ensure correct sizing