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Then why is it when a human does it it's a sign of friendship or happieness as in a smile?
thomasedwin thomasedwin 46-50, M 5 Answers Jan 15, 2013 in Hobbies

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I bare my teeth as a sign of hostility as well, but usually you can tell if it's hostile or not by the facial ex<x>pression.

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When a dog shows it's teeth, it could mean a few other things. It depends on the gesture it gives you. if it's staring straight at you and growling, yes, it'll attack you. If it just did something bad and doesn't want you to know, it'll show it's teeth, like in the video, " Denver the Guilty Dog".<br />
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When people get frustrated, they'll say " Ugghh!!" and show their teeth...

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dogs can smile too.

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that holds true of the human female as well...

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