Collar with Quick Snap Buckle is easy to put on and take off your dog. SUNDOG collars are safer than prong collars and are more comfortable for your dog to wear. This durable, nylon, martingale collar tightens when your dog pulls and loosens when he stops, so it's only tight when it needs to be. These collars give you greater control during walks while also reducing the risk of your dog slipping out of their collar. PetSafe® brand is here to help you and your pet live happy together™.