As stated there is lots of info on the Biewers and the Parti colored Yorkies on here. I own 2 particolored Yorkies, it will also depend on who you ask if they are the same or not. The golddust I am unfamiliar with unless you mean the all gold colored Yorkie. I can tell you that the particolored, gold colored, and traditional colored Yorkies are all Yorkshire Terriers and the difference is in the coloring of the dog. I cannot speak for the Biewers...good luck and enjoy!!
PS thank you for fostering...I applaud you
