NOTICE: Here are very important instructions mentioned in the description below to teach you how to train a dog to accept the dog head harness more easily. MEASUREMENT: Here are 3 sizes for your choice. Please measure your dog's snout before purchase, you can find our size chart in images. SAFETY: Durable nylon strap and sturdy Safety Buckle. Firmness, point force insertion buckle, safety does not take off and anti-dog burst. COMFORTABLE: It is padded enough with fabric around the nose for comfort. Less restrictive of dog’s mouth, it only tightens when pulled, it quickly opens up when the pulling stops. PREVENT PULLING: Our dog head collar helps you train your dog by guiding your dog's head gently while walking and doing activites.The head is where you can control the dog best, which helps stop pulling and better control.