When dogs see their owners excited or happy, they will wag their heads and tails, and their tails will not only swing from side to side, but also keep spinning. The tail is tilted up to show joy; A drooping tail means danger; The tail does not move, showing anxiety; The tail is picked up to show fear; Shake your tail quickly and horizontally, symbolizing friendliness.
The movement of the dog's tail is also related to the owner's tone. If the host says to it in a friendly way, "Bad guy! Bad guy! " It will also wag its tail to express its happiness; On the other hand, if the owner says in a stern tone, "Good dog! Good dog! " It will still pick up its tail and show unhappiness. The human voice is just a sound source, an acoustic signal, not a language. A human smile and a dog wagging its tail are similar ways of communication.
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The relationship between dogs and humans can be traced back to tens of millions of years ago. The domestication history of dogs was about 15000 years ago in the Middle Stone Age. Some scientists even demonstrated from the perspective of genetics that dogs were domesticated by humans as early as 654.38 billion years ago.
Humans deciphered the dog's genome for the first time in 2005-even before researchers used genetic tools to track the dog's earliest home. Early studies have found that dogs in East Asia have a high degree of genetic diversity, and other key markers have been found in many rural dogs. Therefore, they pointed out that East Asia was the first place where humans domesticated dogs.
Researchers at the University of Arizona in the United States unearthed two dog skulls at least 33,000 years ago from Belgium and Siberia, respectively, indicating that dogs have been tamed by humans as early as ancient times.
Baidu Encyclopedia-Dogs wag their tails
Baidu Encyclopedia-Dogs (Canine Mammals)