Dog Puppy Collar, Very Sharp Spikes, Rivet PU Leather, 2″ wide S M L XL Great for medium & large sized dogs2″ wideSpikes are very sharpAdjustableThick durable PU LeatherPlease add 1-1.5″ for a more comfortable fit Small: 15-18″Medium: 17-20″ Large: 19-22″X-Large: 21-24″