Choosing the tame ones
How Did Wild Animals Become Pets?
Nobody set out to invent the dog. People kept the calmest animals, over and over, and the animals changed.
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Step 1 of 5
Wild animals mostly keep away from people.
Being wary is useful when a large animal might eat you, so most wild creatures will not come close enough to be handled at all.
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Step 2 of 5
But some are born bolder than others.
Within any group, a handful are calmer around people than the rest. Those are the ones that came for the scraps, and the ones people could keep.
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Step 3 of 5
Keeping the calm ones is a choice, repeated.
The tame ones are fed and their young are kept; the rest are not. Do that for enough generations and calmness stops being rare and becomes ordinary.
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Step 4 of 5
Other changes arrive uninvited.
Russian foxes bred only for tameness had floppy ears within twenty generations. Tame animals tend to end up with floppy ears, patchy coats, curlier tails and shorter faces, and nobody was choosing for any of that. It comes bundled with the calmness.
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Step 5 of 5
It is the same idea as adaptation, with people doing the choosing.
In the wild, the place decides who survives. With a pet, a person decides — which is why it happened so much faster than anything in the wild does. Dogs were already living alongside people at least fifteen thousand years ago.
Cats are the odd one out. They largely moved in on their own, following the mice that followed stored grain, and were tamed far less thoroughly than dogs.
The short version
Pets were not invented — people kept the calmest wild animals to breed, again and again, and after enough repeats the calmness was ordinary and other changes came with it.
Try it yourself
Look at a dog and a wolf side by side in pictures. Count the differences in the ears, the tail and the face — almost none of them were chosen on purpose.