20. Boxers
Boxer dogs are very protective of their families – and so if they’re not trained to accept strangers, they can mistake a newcomer as a threat and become aggressively defensive. Their attack strategy, moreover, is to use their massively powerful jaws to clamp down and then hold tight. And in 2010 one 11-year-old Scottish girl found this out to her cost: after she was bitten by a boxer, it took a couple of men five minutes to pry apart the dog’s jaws.
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