http://dandugmore.netfirms.com/color.html
Your dog if it had no hair, but only had skin pigment showing, would have the exact required color pattern on it's skin as written in the standard. All the way from the back of it's head, down it's neck to the root of it's tail there will be blue skin. The shade will correspond with the depth of the dog's blue hair. The blue skin extends down the forelegs to above the stifle. The end of the dog's tail would have a darker blue tip than the dog's back color.
go read up ppl!!!! especially if the other pups look like yorkies and this one came out diff it just a gene thing and im sticking to that oh and here's a pic of coco after her bath is not that good but you can see they have the same shape face/ bone structure!!!!