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 club (dog) club, the breed club will maintain all records for the breed, especially the stud book. A breed's stud book is the record of all registered dogs of the breed, going back to the breed's foundation stock. For many breeds, there is one national breed club and multiple local breed clubs. The local clubs are members of the national breed club, which in turn may be a member of the national kennel club. Most countries have one national kennel club, which maintains the records of the breeds (stud books) of member clubs in a central location. The national kennel club also