My dog does this weird thing when he smells something.?

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It's not everything, but when he sniffs something he sort of slowly clenches his teeth up and down, sort of like slow motion chattering of the teeth...it's hard to describe
but at first i thought he was weird because it seemed to do it when he would go up to smell peoples' privates parts when saying hello or someone's underwear, but then sometimes he does it after smelling other stuff
very confused any advice that IS NOT PREVERTED is greatly appreciated
 
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