The PetSafe Premier Martingale Pet Collar reduces the risk of your dog slipping out and escaping while on walks. Used with a leash or with your hand, the stylish pet collar tightens when your dog pulls and loosens when he stops, so it's only tight when it needs to be. This pet collar also gives you greater control, while being safer than choke chains or prong collars. Helps prevent dog from slipping out of collar for safe use Gives you more control; tightens when dog pulls and loosens when dog stops Comfortable alternative to choke chains or prong collars Pet collar is made of nylon for durability Petite collar fits neck sizes 5 in. to 8 in.; small collar fits neck sizes 8 in. to 12 in.; medium collar fits neck sizes 10 in. to 16 in.; large collar fits neck sizes 14 in. to 20 in. 1 year limited warranty Note: This product may require up to 2 additional days for order processing prior to shipping