A Biewer is a tri colored yorkshire puppy with German lines that trace back to lines created by Werner Biewer starting in 1984. Heir Biewer marveled at the beauty of these dogs and went about breeding more. Mr Biewer was unable to show these tri colored dogs as Yorkshire terriers due to their coloring, they were classified as "off color". He was allowed to start his own breed (evidentally very easy to do at the time?) which he did, then allowing him to show these beautiful little dogs in Germany. No one disputes the origin of these puppies is the yorkshire terrier. (certainly not Mrs. Biewer)
However, they are the same dogs as the Parti Yorkie that had been seen in the states. In 1976 a tri colored yorkie named triplicate was born to some well known yorkie breeders and documented. These breeders however did not try and make this "off color" dog it's own breed, but sold the pup as a pet, as most other breeders of the time did who experienced these types of pups. In the states, these tri colored puppies are AKC registered and DNA accepted to be yorkies, as that is their origin. (Accepted that is except by the YTCA) It is not as easy to just "Make them their own breed" here in the states as it was/is in Germany.. there are rules and reasons that need to be followed. It doesn't just happen because someone wants to show a dog and they don't fit with what is already accepted. (although believe me, there are lot's of people who are trying)
If you look at the "BIEWER" as really a color designation.. just like "PARTI" is here it helps. In Germany.. a litter of pups actually can have traditionally colored pups in it that are registered as yorkies and "Biewer" pups (tri colored pups) that are registered as Biewers... which is still how we register litters of "carriers" today, however, the BIEWER is a color designation that denotes the dogs have GERMAN Lineage.
In the states, a litter that has carriers in it is all just registered as Yorkies, some would be Parti yorkies, some would be traditional.. but they all are Yorkies.. You don't change BREEDS based on their color.
That may have confussed more than it enlightened??? Sorry if it did
Diana