They are among the most popular small-breed companion dogs, faithful and prone to picking a favorite human.
1. The smallest breed worldwide The world's smallest dog is the Chihuahua.
The American Kennel Club breed standard limits them at 6lb. Pearl, a Chihuahua, holds the Guinness World Record for the smallest dog at 1.22lb and 3.59in.
2. Mexican heritage The Chihuahua, a popular small dog worldwide, originated in Mexico.
Despite their possible Malta origins, archeological evidence suggests they were evolved as companion animals for the Toltec and Aztec civilizations.
3. Rivers meet Chihuahua means "between two waters" in Nahuatl.
4. Two breeds Two Chihuahua breeds exist: long and smooth-coated.