http://aussiepet.wixsite.com/news/single-post/2016/05/14/Mаrtіngаlе-Cоllаr-Bеnеfіtѕ
A martingale collar is a type of canine collar that offers more control over the dog without the awful effect of a chain collar. The no-slip dog collar is also known as martingale collar. The no pull collar was designed for dogs that their necks are larger than their heads, and can easily escape of nylon collars. The whippet dog collar have obtained popularity among other pet enthusiasts.