Will not choke, pressure is applied at the back of the neck versus 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 8 weeks and older and can be worn up to 18 hours per day. Comes with easy to follow instructions, a training guide and a move comprehensive training dvd. Search_Phrases: Dog Flea Collars Leads Collars,Gentle Leader Headcollar Black Extra Large,Premier Pet Products Color: Black