Country Brook Design Sprockets Deluxe Dog Collar - Extra Large Collar fits 18 inch - 26 inch size neck. There are no standard sizes for dog collars. Please be sure to measure your dog for correct size. Measure around your dog (with string or tape measure) snugly where you want the harness to lay. If you have any questions or problems with sizes please give us a call before ordering. 256-974-0700 Breed Recommendation: German Shepherd, Golden Retriever, or Great Dane Made in U.S.A. with top quality hardware Made using polyester webbing