X-Small: 8-10 in L x .375 in W No-slip, adjustable, nylon choke collar for training purposes. No-slip, adjustable-choke collar is an excellent solution for dogs, such as greyhounds, who slip out of their collars. Ideal for training, its limited closure prevents the choke from becoming too tight. Not intended for use as your dog's primary collar. Do not attach I.D. tags or leave on your dog unsupervised.