I just recent got a female Yorkie who is supposedly pure bred and is 5 months but she is two times bigger than my sister's male Yorkie who is 6 months. So I went online and searched for some pictures and came across one where she looked like a Shih Tzu mixed with yorkie.
Now my question is, how do you really know for sure if your dog is pure bred?
(she have the black and brown colors. but she also have thick hairs. alot of thick hair that is half black and the inside gray on her body.)
HELP!!!!


i've attached two pictures. the one standing is the Shih Tzu mix with Yorkie that I found online and the one sitting is my Georgina.