A muzzle is a device, usually made of leather, that is cyllindrical in shape. Muzzles are placed over the snout of an animal to keep it from biting harmfully. Muzzles are usually used on untrained dogs, large or small, to prevent either unwanted biting or unwanted barking. They can also be used on particularly vicious dogs or other animals. They are usually made with a strong buckle or other fastening device for this purpose. Muzzles have air holes in them to allow the animal to breathe. In the case of dog muzzles, they can be found in most pet supply stores. Human nose Anatomically, a nose is a protuberance in vertebrates that houses the nostrils, or nares, which admit and expel air for respiration. ... A bite is a wound received from the mouth (and in particular, the teeth) of an animal. ... Trinomial name Canis lupus familiaris The Dog is a canine carnivorous mammal that has been domesticated for at least 14,000 years and perhaps for as long as 150,000 years based on recent evidence. ... Phyla Porifera (sponges) Ctenophora (comb jellies) Cnidaria Placozoa Bilateria  Acoelomorpha  Orthonectida  Rhombozoa  Myxozoa  Superphylum Deuterostomia     Chordata (vertebrates, etc. ... For the English historian, see Henry Thomas Buckle A buckle is a clasp used for fastening two things together, such as the ends of a belt, or for retaining the end of a strap. ... A pet store or pet shop is a store at which one can purchase supplies for pets and, often, the pets themselves. ...