Chihuahua (dog) The affected chihuahua will hold its leg flexed, and foot off the ground until the quadriceps muscle relaxes and lengthens, after which the animal feels no discomfort and continues with activity. Chihuahuas are also prone to some heart-related disorders, such as heart murmurs and pulmonic stenosis, a condition in which the blood outflow from the heart's right ventricle is obstructed at the pulmonic valve. Chihuahua (dog) The Chihuahua () is the smallest breed of dog and is named after the state of Chihuahua in Mexico. Chihuahuas come in a wide variety of colors, and two coat lengths. The Chihuahua's history
Northern breed group clubs, dog sport clubs, minor kennel clubs and internet-based dog businesses. In this Group, the Alaskan Klee Kai (a new breed developed from a mixed breed dog in the 1970s in Alaska, USA) can be still be registered with the American Rare Breed Association as well as with the United Kennel Club. A breed that is not recognised by a kennel club means that it has not been sufficiently vetted according to that particular kennel club's rules. Northern breed group Northern Breed Group is the name of a breed group of dogs, used by kennel clubs to classify a defined