Wire Cage & Leather Muzzle (Miami). Size 0, Black. 6.5" circumference, 2.25" length. For breeds like: Yorkshire Terriers, Chihuahuas Constructed of 100% genuine cowhide and metal Available in Black and over 25 sizes to fit practically every breed Felt-lined nose guard for comfort; Well ventilated and allows for dogs to drink Best fits very small breeds like: Yorkshire Terriers, Chihuahuas To fit correctly, measure: length from dog's eyes to the tip of the nose; circumference from 1 inch below the eyes and around the snout