Chihuahuas are small and surprising dogs, originating from Mexico and named after the state of Chihuahua. They have been around for hundreds of years and were first introduced as show dogs in the 20th century. Chihuahuas are the smallest breed, often weighing less than 3kg and standing at only 9 inches tall. Despite their size, they can live up to 20 years but may suffer from health problems. Known for their intelligence and loyalty, Chihuahuas are often seen as status symbols and have appeared in films and TV shows.