Are pitbulls naturally mean

The pit bull was originally bred and trained to be a tenacious fighter and to display aggression only against other dogs. Some breeders, however, trained and mistreated their pit bulls in such a way as to induce a vicious temperament and aggression toward humans, which generated the dog's negative reputation.

But I think that these creatures are just misunderstood, all dogs can be lovely if given love, care and attention.
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