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.
Dogs originated from wolves and have been recognized, but opinions vary around the specific place of birth and time. The earliest evidence of dog fossils comes from a mandible fossil in Germany 14000 years ago. These archaeological evidences support that dogs originated in southwest Asia or Europe. On the other hand, the characteristics of dog skeleton identification suggest that dogs may have originated from wolves, thus putting forward the origin theory of East Asian dogs. In addition, different breeds of dogs are very diverse in morphology, which seems to be inclined to the hypothesis that dogs originated from wolves of different geographical groups. Archaeology alone can hardly provide reliable clues about the origin of dogs.
The "wartime state" of epidemic prevention and control is a temporary control measure adopted by governments at all levels during the COVID-19 epidemic, which is very different from the "state of war" stipulated by law, aiming at highlighting the extreme importance of epidemic prevention and control, strengthening the sense of responsibility and enhancing the sense of hardship; Judging from the relevant contents of wartime state, it mainly involves measures such as epidemic prevention, personnel control, material distribution, and work coordination, with the aim of mobilizing people to obey the unified command, coordination, and scheduling of party organizations, so as to ban them. Abuse of "wartime state" is not conducive to the overall situation of fighting the epidemic.