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
Breed type (dog) very ancient or modern in origin. "Modern breeds of dogs" are refinements of older dog types, bred so that all closely resemble each other, and documented in a stud book kept by a breed club or major dog registry. A "purebred dog" is a dog of a documented modern dog breed that has been selectively bred to emphasize "breed type" for the sport of competitive conformation dog showing. The word "type" may be incorrectly used instead of "style" to refer to an identifiable 'style of appearance' or 'working style characteristic' of a particular kennel or "dogs of a well established