The incidence of liver shunt and portal vein hypoplasia is quite high in Yorkiess, but I have had five Yorkies and have never had any liver issues. Katie's breeder tests all of her puppies and dogs she breeds. I am reminded of what my vet kept telling me about my Yorkie who passed alway almost four years ago close to her seventeenth birthday. I was always so worried about Ashley, and my vet told me I should just enjoy her.
I think it's very important to be aware of the diseases that are prevalent in Yorkies, however, just so you can be proactive. It is also so important to enjoy each moment with these precious babies.
http://www.vet.utk.edu/clinical/sacs...2013-09-26.pdf