Do you have small children? Is anyone teasing him? Is he on the small size?
Usually this is in response to them having quick hands/arm movements toward them and their way of protection. You also have to remember that yorkies are Terriers! They are fast, can change on a dime, but yet loveabe and cuddlers as well. They are extremley stubborn and very intelligent. I highly recommend the Dog Whisperer books! As he states - there are never any bad dogs, just misunderstanding owners.
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