baby yorkie,
This has happened to me as well...
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Now back to the Topic...
Are you guys sure you got Yorkies ! ?
Mine are just TERRORS and afraid of NOTHING when it comes
to a local violation of their space !!!
I've had my Male for two years, and he's SO territorial it's sad.
And when my Female Becca (a puppy) came, she would hold back
a few feet to watch him, see what he was objecting to, and NOW
she will beat him to the "threat" and is absolutely fearless !
(and She's only 6 months old)