Country Brook Design | 1 1/2 Inch Spring Pines Martingale Dog Collar - Extra Large Collar fits (23in - 31in) 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: German Shepherd, Golden Retriever, or Great Dane Made in the U.S.A. Made using patterned polyester webbing Made with top quality hardware