Dog Collar – Studded Spikes Rivet PU Leather – 2″ wide – 15 Colors S, M, L, XL Perfect spike collar for medium to large sized dogs. Collar is made of thick durable PU Leather and measuring an impressive 2″ wide. Collar is adjustable and comes in 4 sizes & 15 colors! Sizing:Please add 1-1.5″ for a more comfortable fit Small: 15-18″Medium: 17-20″Large: 19-22″X-Large: 21-24″ The LENGTH of the collar is, (including buckle)Small: 21″Medium: 23″Large: 25″X-Large: 27″