I'm not making excuses for dogs running loose, but some good pets can become vicious when running with other dogs. Not disimilar with what happens when a group of teens get together and get destructive even though, as individuals, they seem like good kids.
Chances are that each dog is someone's pet and "such a good dog" when at home curled up on the couch.
Not saying that true feral dogs in packs don't exist, or that delinquent pets can't be just as destructive.
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