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) trains judges and organizes multiple breed dog shows and other activities. When a breed club writes or changes the standard for its breed, a club which is a member of a national kennel club will submit the standard to the national kennel club for the breed club's country. When the kennel club accepts the standard it is said to be a standard of that national kennel club, but it is originally written by the breed club. Working and hunting dog breeds have breed clubs that define the appearance of the breed, but emphasize working or hunting ability in the selection