When a rat terrier bites, it will be lucky if it's be able to break the skin. When a pitbull turns on someone, it effectively rips a childs entire face off and has been well known to kill and adult! The true stories are endless, thus the reputation.
Even "good dog" breeds (as you refer to them) can turn on a human, sometimes even unprovoked. That's why we call them "ANIMALS". The same applies to the four drug thugs that shot the college kid in the head for his cellphone last week. Starting to click with you now?
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