LupinePet Originals 1" Turtle Reef 19-31" Containment Collar Strap for Large Dogs Add some flair to your dog's receiver collar Works with PetSafe, Invisible Fence, Pet Stop and DogGuard electronic containment receivers For use with compatible containment systems only. This collar is not for leash walking your pet. Proudly built in Conway, New Hampshire GUARANTEED (Even if Chewed)