Is it possible for a dog to smile?

Okay so don't think im crazy but my dog is smiling at me showing teeth..And I'm freaked out because i cant move without her staring at me with a blank stare for 5 minutes, than she smiles with teeth and runs after me, and i freak out because she won't stop smiling at me and its making me nervous.. the... show more Okay so don't think im crazy but my dog is smiling at me showing teeth..And I'm freaked out because i cant move without her staring at me with a blank stare for 5 minutes, than she smiles with teeth and runs after me, and i freak out because she won't stop smiling at me and its making me nervous.. the smile is sooooo creeepy.

please help!
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