Chihuahuas are the smallest dog breed in the world. They are also one of the longest-living dog breeds, with a lifespan of up to 16 years, although some have been known to live 20 years or more.

The smallest dog breed in the world is commonly regarded as a Chihuahua, according to Highland Canine. Named after the Mexican city, Chihuahuas have an average height of 5 to 8 inches, weighing no ...