Uni does it all the time! When she bites us during a harsh play time or we take away a toy when she fights with Toto she does the teeth chattering. It's like she gets nervous or is sorry for biting us.
__________________  The T.U.B. Pack! Toto, Uni, & Bindi
RIP Lord Scrappington Montgomery McLimpybottom aka El Lenguo the Handicapped Ninja 10-12-12 
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