This dog halter is designed to gently guide the dog's head and then control the dog's direction of movement (similar to a horse halter). A head collar prevents your dog from pulling on the leash and reduces unwanted pulling, jumping, or sprinting behaviors. You don't have to put too much effort into their behavior. Walking without a collar becomes safer and more enjoyable for you and your dog. DURABLE AND PRACTICAL - The dog halter is made of thick, durable nylon and heavy-duty stainless steel. A firmly stitched head harness for medium and large dogs or dogs on heavy leashes. This pet collar comes with an auxiliary leash that can be attached to a dog collar or leash. The reflective stripes on the dog collar help keep your dog safe day and night. COMFORTABLE AND SECURE - The nose ring padding is soft enough to not compromise toughness, so a very comfortable dog halter prevents skin from rubbing your dog. The cotton will still prevent the edges of the straps from fraying the dog's nose when worn for long periods. It relieves pressure on your dog's throat and prevents your dog from choking or gagging, allowing your dog to bark, pant, eat, or drink. EASY FIT - These no-pull dog collars feature a quick-release buckle so you can put it on your dog in minutes. The straps are adjustable in length so you can choose the most comfortable length for your dog. This dog training collar will also come with a free training guide to help your dog get used to it. Size: Mouth: 11.6''-14.8'', Neck: 16.8''*21.1'' Choose a soft measuring tape or ruler and measure along the dog's nose 1 inch below the eyes with the mouth closed, then measure the circumference of the neck.