Shih tzus do not bite. I have a shih tzu and she has never bit
me, no matter what. She is the sweetest thing. Some of my friends
have shih tzus to and I have never heard that they have bit anyone.
The only time my shih tzu bit me was when we were playing tug of
war with her rope and she missed the rope and got me, and when I
stuck my finger in her mouth. (Don't ask why). Also, if a shih tzu
ever bites you it doesn't hert (sorry on spelling there).