I've had one Peke killed years ago by a Pit and I almost had my puppy Peke killed recently when a Pit jumped over my backyard fence and tried to run it down. I managed to tackle the Pit about 1 sec before the dog bit my pup in half. I don't care who raises these dogs, it's in their nature to kill smaller animals if given the opportunity. You should have to have a special permit to own them and there should be no ownership inside of city limits. And the most important change needed, is holding the owners accountable, not just the dog.
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