dog

Some scientists believe that dogs were domesticated from gray wolves by early humans, and the domestication time was 40,000 to 15,000 years ago. Known as "man's most loyal friend", it is the pet with the highest keeping rate, and its life span is about 12 to 18 years [1] . In Chinese culture, the dog belongs to one of the twelve zodiac signs, and is the 11th in the twelve zodiac signs. [2]