Hi. I suspect it's a little more simpler than that. And coincidentialty unusual to have two in two days but if you go to google and type "blue born yorkie" you will get about 6 links to yorkie talk and that's about it in re blue born. You will also get the links you've posted in.... and if I personally had one, or thought I had one, I'd ask to see yours too, so that I could check if I was on target.
Just another perspective. That being said, don't ignore your instincts but I really think it is probably more innocent that anything... Here are the first links you get...
HELP my friend has 2 blue puppies - YorkieTalk.com Forums ... YorkieTalk.com - Yorkshire Terrier Community › ... ›
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May 7, 2005 – The dd gene is what causes this at birth and the
Yorkshire Terrier should only be carrying the DD. A
blue born puppy will also have self colored
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