I don't own a dog but I have many friends that do. I belive that dog muzzles are so important. Not because dogs are mean but to make other people more comfortably around your animal. A lot of people get very timid around dogs they don't know. For another reason, muzzles are good for puppies who like to nip and think they're playing. It's a good way to train them. Lastly, muzzles for dogs who are more aggressive are especially needed.