●Please note: Please read and observe our product description carefully. Or you can watch the video in the product images to learn how to get a dog used to wearing a muzzle (L, black). This is important because dogs wearing a muzzle for the first time will try to tear or bite it off ●Measurements: Measure the circumference of the dogs mouth and neck. Please check the second picture and choose the correct size. It is important that you order the correct size ●Adjustable: Different sizes for different breeds are available so you can find the perfect fit for your dog ●High quality: Made of durable, high-quality nylon which is suitable for daily use and comfort when wearing ●Prevents biting: Perfect for aggressive and energetic dogs to use during training or for daily walking