Start with 4 wolves.
1: ‘nice 2 & 3 ‘normal’ and 4: ‘angry’
Allow 1 to breed with 2/3 and see if the pups are “nice” and DO NOT breed 4
If pups are “nice” then repeat with “nice” pups until pretty much all wolves born are “nice”
Do this for 20 or 200 or 2,000 years and you have dogs, not wolves.
Do the same thing for any trait(s) you desire.
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