There are many Biewer breed clubs in Germany, there are some here in the states..yes the Biewer has it's own standard.. as does the Parti, which is the AKC version of the Biewer. Not all of the Biewer breed clubs agree on what the Biewer is or where they want the Biewer to go.. however I believe they all agree that the Biewer came from two traditional yorkies without any other dogs being introduced.
There was One club that eventually differed from this idea, the BTCA. They called the Biewer a
Biewer Terrier, however, most do not believe in their "findings" because of the questionable data and questionable leadership among other things. I don't believe this club is still around or if it is, will get very far.. just my opinion of course.
Yes.. the Parti yorkies is still a yorkie, and the color would be considered a "fault" according to the Yorkshire Terrier Standard.
-Diana