Country Brook Design | Summer Pines Ribbon Martingale Dog Collar Collar fits (15in - 21in) 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. Breed Recommendation: Greyhound, French Bulldog, or Collie Made in the U.S.A. Polyester grosgrain ribbon sewn onto 100% nylon Made with top quality hardware