The martingale, which is often referred to as the “humane choke chain,” is a great training tool when used appropriately.  Best known as being used on greyhounds that are prone to slipping out of collars, thanks to necks that are significantly wider than their heads, these collars are also great for dogs that routinely escape collars or harnesses.  There are certain precautions that pet owners should take, however, when finding the right martingale dog collar for their needs. What is a Martingale? A martingale collar is composed of two loops:  one large loop, which goes around the dog’s head, and a second smaller loop, which attaches to the leash.  When pressure is applied to the leash, the smaller loop will tighten the larger loop, placing pressure on the dog’s neck.  This method is considered more humane than a typical choke chain because the wide fabric ensures that pressure is more...