No only implausible, it's been proven to be wrong. There was a TV programme recently about a long-running Russian project to change the characteristics of the Arctic Fox (IIRC) by selective breeding. They selected for lack of aggression and in very few generations produced animals which were as friendly as dogs and, interestingly, showed other dog-like traits like floppy ears, variegated coat colour and wagging tails. They also bred a different bunch for aggression and ended up with homicidal maniacs. As a cross-check, they swapped puppies between docile and aggressive mothers at birth, but genetics decided the puppies' behaviour as they grew, not their mothers' behaviour.
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