This dog halter is designed to gently guide the dog's head and then control the direction of the dog's movement (similar to a horse halter). A head collar prevents your dog from pulling on a leash and reduces undesired behavior of pulling, jumping, orsprinting. 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's head halter is made of thick durable nylon and heavy duty stainless steel. Securely stitched head harness for medium and large dogs or dogs on heavy leash. This pet head collar comes with an auxiliary leash that can beattached to a dog collar or leash. The reflective stripes on the dog collar help keep your dog safe day and night. COMFORTABLE AND SAFE - The padding on the nose ring is soft enough to not compromise toughness, so a very comfortable dog halter neck prevents skin from chafing your dog. The cotton pad will still prevent the edges of the straps from fraying the dog'snose when worn for extended periods of time. 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 collars for dogs feature a quick release buckle so you can put it on your dog in minutes. The shoulder straps are adjustable in length so you can choose the most comfortable length for your dog. This dog training head collar willalso come with a free training guide to help your dog get used to it. Size: Mouth: 11.6'-14.8', Collar: 16.8'*21.1' Choose a soft tape measure 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.