Domestic animals like dogs, sheep, goats, and pigs changed during thousands of years of domestication, too. Perhaps the most obvious change is called neoteny, or the process of becoming more childlike. Domestic animals tend to be smaller, developing softer facial features like floppy ears and short snouts. Other changes are more dramatic: domestic pigs have an extra pair of rib bones. Humans weren’t exempt from this process. We also domesticated ourselves.
