[LunarBerry]

Also, when you have a breed based mostly off two breeds (even established ones), they may tend to favor one or the other at times. Or in some cases, a nice mix of the two. If this dog is half yorkie and half Australian terrier then it's what us folks in the USA call Silky Terriers but as the link I've presented mentions, it'll be Australian Silky Terriers, or some may even refer the silky part as yorkies, but they cannot be officially called yorkies, because there's only one established breed of yorkshire (yorkie) terrier. Biewer terriers are relatively newer than Yorkshire and though very strongly related from that breed's lineage, they are very specific in coloration as well as the other poster mentions, are established from Germany and not from Yorkshire, Britain.