Country Brook Design Nylon Premium Traditional Dog Collar Collar fits 26in - 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. If you have any questions or problems with sizes please give us a call before ordering. 256-974-0702 German Shepherd,Golden Retriever,Great Dane,Rottweiler,Cane Corso,Mastiff,Akita,Labrador,English Mastiff,Chesapeake,Boxer,Saint Bernard,Bull Mastiff Made in U.S.A. with top quality hardware Six laser-cut holes for growing dogs