If you kind of look like your parents, it's because parents pass some of their features on to their children. The same thing happens to animals. Angry animals will most likely have angry babies and nice animals will likely have nice babies. For a long time, people only let the nice dogs live with them and make babies and made all the wild dogs go away. This is called domestication. Wild dogs are wild so they make more dogs who take in the "wild" feature of their parents. Nice dogs are easy to find because of domestication.
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