Martingale collars, also called no-slip or limited-slip collars, are a type of dog collar that provides more conrol than a typical flat collar, and prevents dogs from backing or slipping out. they look similar to a flat collar but have a D=ring and loop is made from chain or BioThane.
The collar works by constricting when the dog pulls on the leash. Tension on the leash causes the loop to tighten, shich in turn pulls the larger loop tighter – but not too tight! Martingale collars are adjustable, and should not tighten past the width of the dog’s neck. they offer comforable security without harming your dog. When pulled tight, you should have a two finger space between D-links.