Gentle Leader Complete Training System Petite Hot Pink for Dogs under 5lbs. Straps are made of supple nylon. Won't choke...pressure is applied at the back of the neck vs. the front of the throat. Not a muzzle...when fitted properly a dog can open its mouth to eat, drink, pant, fetch, and bark. Can be used with dogs eight (8) weeks of age or older. Can be worn up to 18 hours/day.