Lupine 1 Inch ACU Containment Collar Strap for Medium and Large Dogs Add some flair to your dog's receiver collar Works with PetSafe, Invisible Fence, Pet Stop and Dog Guard electronic containment receivers Several adjustable neck size ranges to ensure a perfect fit Proudly built in Conway, New Hampshire - GUARANTEED (Even if Chewed) Adjusts to fit a neck size between 12-17 Inch