Dogs Kingdom 17"-20.5" Faux Croc Leather Spiked Dog Collar 2" Wide, 40 Large Spikes Strong and durable PU leather S:Overall length 22", will fit 17"- 20.5" neck M:Overall length 25", will fit 19"-23.5" neck 2" wide double layer faux leather Kindly please confirm the neck size for your pet before your order.