Historically, "pit bull" was an informal and slang label used to describe any dog that was subjected to the cruel sport of bull-baiting - using dogs (of any breed) to seize tethered animals such as
Is there a breed of pitbull that hasn't been breed for fighting, therefore having a calmer and safer mood? - Quora
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Is Pit Bull a dog breed or a collective name given to dogs of particular traits? - Quora
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