Dogs belong to Chordata, Vertebrate, Mammalian, Orthoptera, Carnivora, Schipoda and Canidae. Dogs, also called "dogs" in Chinese, belong to Carnivora and are distributed all over the world. Dogs, horses, cows, sheep, pigs and chickens are also called "six animals".
Some scientists believe that dogs were domesticated by early humans from gray wolves. The domestication time was from 40,000 years ago to 1.5 million years ago, and it has developed to this day. Known as "the most loyal friend of mankind", it is the pet with the highest feeding rate at present. Its life span is about ten years.
In China culture, dogs belong to one of the 12 Zodiacs, ranking 1 1 among the 12 Zodiacs.