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A dog is an instinctively aggressive creature. In the wild, aggression came in very handy: dogs needed aggression to hunt, to defend themselves from other creatures, and to defend resources such as food, a place to sleep, and a mate. Selective breeding over the centuries has minimized and refined this trait significantly, but there's just no getting around it: dogs are physically capable of inflicting serious harm (just look at those teeth!) because that's how they've survived and evolved. ...
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