Hi and Welcome to YT!
The Yorkie's hormones are still in his system, it can take a few months for these to go away. Sounds like he was 'protecting' friend/kennel mate. The Yorkie needs more training, he needs to feel confident that YOU have all situations under control, and that he respects you. He needs to learn what is acceptable behavior and what behaviors will not be tolerated.
Yorkies learn best using Positive Reinforcement techniques....
Last edited by kjc; 03-14-2014 at 04:24 PM.
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