Yorkies change color along the spine. What you are calling white is more then likely breakage of his color (his shade of blue) from the black puppy coat they are born with. I have seen some dogs who do have white hairs- but it is mostly course like the gray/white hair that some of us get when we get older and no amout of hair dye will cover.
If you baby is chaning color at this time it is just his/her genetic code kicking in and saying it is time. Some may change quickly some may start and take years to complete the process. |