Country Brook Design | Double Secure Deluxe Nylon Collar Collar fits 13in - 16in neck. There are no standard sizes for dog collars. Please be sure to measure your dog's neck for correct size. Measure around your dog's neck (with string or tape measure) snugly where you want the collar to lay. Made in the U.S.A. and Features a YKK side release buckle Zero pressure on the deluxe buckle Made with 2 heavy welded D-rings Double the strength and security