*This is a martingale collar listing although the photos show a buckle collar. The pattern is the exactly same.* Strong, quality beautiful martingale collars are great for: training, walking, improved control, and preventing slips and escapes. Perfect for all sight hounds (ex: greyhound), puppies, and easily distracted or slippery dogs. The martingale is considered a "humane choke collar". It does NOT choke your pup but instead distributes pressure evenly on the neck. When your dog pulls the collar tightens to a set amount and does not continue to tighten as he/she pulls. This feature prevents your dog's head from sliding out of the collar and also prevents internal damage to your dogs throat. Win Win! Martingale collar are an alternative method to house collars, choke collars, and harnesses. They are safer then other types of collars when used properly and easier to put on then a harness.  Regain your dog's attention and focus + no fear of escapes = for a more enjoyable walk. Please measure your pup's head and neck for proper fit.Small          10.5-14 inches Medium      12-17 inches Large          15-21 inches Measure your dog for best fit. Measure their head and neck-this type of collar does not have a buckle so you must slide it over the dogs head, then adjust to tighten or loosen on the neck. No buckle make this collar more secure-strong dogs can't snap it.  Available in small, medium, and large. The small is 1" in width while the medium and large are 1.5" in width. Not for tie out use. Supervise dog while wearing this type of collar. Now, your dog can feel like an Alpha while you're still in control!