All Uncommon Paws designs are available in a Martingale style collar. Martingale Collars, come in widths of ¾ inch, 1 inch and 1½ inch. The safest and most commonly used collar for all Sighthounds is the "double-loop" safety collar, widely known as the "martingale" or "humane safety choke" collar. It is two loops - the larger loop adjustable to the size of the dog's neck; the smaller loop, often referred to as the handle, has a D-ring attached to it. When a leash is attached to the D-ring, the larger loop tightens around the dog's neck and prevents the dog sliding backward out of the collar. The restraint is firm and secure, but does not pinch or gag the dog.