As to the Parti Yorkshire Terrier: I have done some extensive research and found that the Parti-color have been in the Yorkshire Terrier's as "recessive genes" that can be traced back to the 1800's.
Parti-color is having irregular patches or two-colors, typically black and white.
Biewer-Piebald is having three-colors on the head and having irregular patches of two-colors on the body, typically black and white.
Now, as to the Biewer Yorkshire Terrier:
Here in the US, they are called: Parti Yorkshire Terrier's
In Germany, they are called: Biewer Yorkshire Terrier's (a la Pom Pon).
The Biewer is acknowledged in different countries by different names and the only distinguishing factor is:
"What is your dog's bloodline?"
Do you have a Parti from United States, which is most known to come from Nikko's line?
Or Do you have a Biewer from Germany, which is known to come from Mr. & Mrs. Biewer's line?
The Parti -is per AKC -US.- considered a Parti-color: is two or more definite, well-broken colors, one of which must be white. *If you hear the term Parti Yorkie, they are talking about the color of the Yorkie.*
AKC does register themonly as Yorkshire Terrier's.
The Biewer -is per ACH e.V., IHR e.V., and IBC -Germany- considered a tricolor or piebald: is three definite colors on the head, and two well-broken colors of the body, one of which must be white. *If you hear the term Biewer Yorkie or Biewer Yorkshire Terrier, they are talking about the color of the Yorkie*
ACH e.V., IHR e.V., and IBC does register them only as Biewer Yorkshire Terrier's.
*Please Note* There are some club's here in the US that recognize the Biewer Yorkshire Terrier as a Yorkshire Terrier with a color variation and others like AKC that recognize them as Biewer Terrier- a totally separate breed.
Biewer Yorkshire Terrier explained on "Our Little Lord" Page.
The Parti Yorkshire Terrier
-Brief-History of the United States Parti Yorkshire Terrier: On December 10, 1976 (8 years before Mr. Biewer's tricolored puppy) were two women named, Joan Gordon and Janet Bennet that had a "parti-colored" male puppy, named "Trippy" born in their Champion Kennel from their "Wildweir Line" Yorkshire Terriers. They decided to keep him and registered him with the American Kennel Club (AKC) as a Black and Tan Yorkshire Terrier because AKC had no parti-color classification at that time. Trippy lived to be 12 years old. Joan claims that at the time Trippy was being born, she had heard of "tricolored" puppies being born in England and that the tricolored pups were imported to Germany from English stock. This means that parti-colors and tricolored (piebald) Yorkies were showing up in litters in the 1970's and earlier, and that Germany's Yorkshires came from English stock, where the Yorkshire Terrier originated from.
Sometime in the 1980's on the opposite side of the United States were the Lipman's- Gloria, with Nikko's Kennel. They were doing the exact same thing as Mr. and Mrs. Biewer. Nikko's Kennel purchased a couple of female Yorkshire Terrier's from Streamglen Kennels, one being "Streamglen Milady" and they also purchased their Champion Sire, "Ch. Quarnhill Fusspot" from Stoneybrook Kennel in 1971. They bred Ch Quarnhill Fusspot to Streamglen Milady and began producing champion Yorkshire Terriers. They continued to line and in-breed and in the 1980's the "parti-color" puppies started showing up in Nikko's Kennel as well. Gloria couldn't bear to put the pups down, so she passed them out the back door as pets and told customers not to say where they got them from.
This is when the Parti Yorkshire Terrier was acknowledged: Here in the US, Summit and Crownbridge were all getting parti-colored and/or tricolored dogs registered with AKC, as they were born from (2) two AKC registered dogs and they wanted the right color to be shown on the papers as: black, white and tan. So, it was sometime in 2000 after 18 months of DNA testings, that AKC accepted the parti-colored dogs and the name "Parti Yorkshire Terrier" has stuck with AKC's Yorkshire Terriers for the last several years.
Just to re-cap:
Are you confused Yet? Well it can certainly be confusing and unbelievable but there are in fact: Two different Yorkshire Terriers: