Adjustable. Special curved buckle. This collar fits most large size dogs such as: Afghan Hound, Akita, Alaskan Malamute, Bernese Mountain Dog, Black and Tan Coonhound, Bloodhound, Borzoi, Doberman Pinscher, German Shepherd, Great Dane, Great Pyrenees, Greyhound, Irish Setter, Irish Wolfhound, Newfoundland, Pointer, Rhodesian Ridgeback, Rottweiler, St. Bernard. Made in Taiwan.