The martingale collar is designed for dogs with narrow heads such as Greyhounds and other sight hounds (such as the Afghan hound, Saluki, and whippet) or dogs that have necks as big as their heads (such as pit bulls, mastiffs, bull dogs). It is also useful for a dog of any breed who is adept at slipping out of his collar. The martingale consists of a length of material with a metal ring at each en
d. A separate loop of material passes through the two rings. The leash attaches to a ring on this loop. When your dog tries to back out of the martingale, the collar tightens around his neck. If the collar is properly adjusted, it will tighten just to the size of your dog's neck and won't choke him. The benefits of the martingale dog collar include limiting the chance that your pet will back out of his or her collar and slip into traffic or another unwanted situation. I know this personally has saved me with stray cats in the neighborhood with my more stubborn dog Ellington.
