all breeds of dog are mixes, thats how they came about, a yorkie is a mix of other breeds way back.
so there really is no such thing as a pure bred yorkie weather the mum and dad are known as full blood yorkies.
and saying that i guess none of us really know that are yorkies are full blood as all we do is trust the breeder and pedigree but whos to say they told us the truth or that a stray mutt with a glint in his eye didnt take a fancy to the lady yorkie and took her on a date so to say
yorkies i said to be bred from the maltease and thats where the yorkies coat comes from so could be from way back or like others have said shes crossed them herself.
i think its cute though