①. Please check the 7th image on the left side of the product web page, which will teach you how to train a dog to accept a muzzle. Because dogs may feel anxious about wearing muzzles at the beginning, such as trying to take off muzzles or bite through muzzles. ②. DESIGN: We add a head strap design, which will effectively help prevent dogs from taking off the muzzle with their paws. ③. MEASUREMENT: Measure the circumference of the dog's mouth and neck. Please check the size map and choose a suitable size. Please double check before purchase. ④. HEAD STRAP: If your dog would not pull off the muzzle with its paw, you can cut the head strap off. Thus, you can wear the muzzle more quickly. ⑤. ATTENTION: Our dog muzzle is not suitable for short-snouted dogs such as Pitbull mix, boxer, Dutch mastiff, affenpinscher, Boston terrier and so on.