Because its a gradual process that takes years, decades even.
Do you know what man made selective breeding is?
Do you think the dairy cow you get your milk from existed in the wild?
It was selectively breeded by man thousands of years ago from Aurochs.
Do you think a sausage dog existed in the wild? It was selectively
breeded by man from other breeds of dogs which if you follow the chain
back came from wolves. There wasn't a point where a wolf gave birth
to a fucking sausage dog.
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