Note: Please check the section or the video in this product listing (XL-Black), which will teach you how to train your dog to accept the muzzle.Measurements: Measure the circumference of the dog's mouth and dog's neck. Please check the second picture and choose the right size. If you're torn between two sizes, the smaller will fit better. Please check carefully before purchasing.ADJUSTABLE: Different sizes to fit different breeds, so you can find the perfect size for your pup.HIGH QUALITY: Made of durable, high-quality nylon that can withstand everyday use and is comfortable to wear.PREVENT BITES: Great for aggressive and energetic puppies, use during training or on daily walks around. Product Notes: Please allow a little manual errors.Due to the lighting of the photos and the difference of monitors, the pictures may not reflect the actual color of the real item. Please confirm acceptance before ordering. About Shipping: Please ensure your shipping informations are correct to avoid delivery issues. All orders are shipped within 3 days after payment. Delivery usually takes 8–12 days, The specific delivery time is depend on circumstances. If you have any questions during your purchase, feel free to contact us. We will respond you within 60 hours.