If they do, it could be because they want to feel more like part of the family, or it's just a particular animal's personality and that animal was matched with the person meant for it.
Another danger at the dog park
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Get in the middle of two guys arguing and get bit!
http://www.google.com/hostednews/ap/article/ALeqM5g3DvA0TEcj0BA6p5KJrL_JpUQfiwD9FTD1AO1
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… wow.
I never considered this possibility before, even when I say the most dangerous creatures at dog parks are other humans, not the dogs! -
Frightening - holy smokes! The human race just makes me shake my head sometimes.