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  She is darling, and I don't know much about blue-born, but she doesn't look like any I've seen on here.  She looks like a normal Yorkie to me, and I hope there is some other explanation for her hair loss.  
 Where is the bald spot on her body?  Are you sure she didn't lick away the spot of hair?  One of my puppies did that once due to itching flea bites.  Maybe you should get a second opinion from a different vet.
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