Slip Leads, every dog lover should carry one in their car or on their person during adventures. You never know when you'll encounter a stray or lost dog. Slip leads are a collar and leash in one. They fit every dog and tighten as the leash is pulled. Slip leads are recommended by top trainers to teach leash pressure and encourage obedience. These slip leads come with a brass bolt snap and extra O-Ring to prevent having to slide the slip over the dog's head. Perfect for dominant/reactive dogs that do not tolerate gear being slid over their head. Can also be used as a regular 6' leash. Slip Leads are designed to get tighter as a dog pulls. This serves different functions, one, it is great for dogs with small heads like Grey Hounds, preventing them from slipping out.