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A lot of people don't realize that dogs, while being domesticated, are descended from wild animals. Their genetic structures are very closely related. Inside every animal there are triggers that set off an instinctual reaction. I'm not familiar with the particular animals in question, however. If an owner abuses or mistreats an animal it can have severe behavioral consequences. So, in short, even the best treated animal can revert to a primal instinct, man included.
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