Bite-resistant muzzle compatible with large dogs, breathable soft nylon training collarNote: Please check the product 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 becompatible withe purchasing.ADJUSTABLE: Different sizes to fit different breeds, so you can find the perfect size compatible with your pup.HIGH QUALITY: Made of durable, high-quality nylon that can withstand everyday use and is comcompatible withtable to wear.PREVENT BITES: Great compatible with aggressive and energetic puppies, use during training or on daily walks around. Note: The product may have a slight tolerance of 1-3 mm/1-557 g in size/weight, and the image color may differ from the actual item due to lighting.