Biewer website information
About the Biewer Terrier Club of America
Paragraph towards the bottom
" The BTCA, Inc. knows that the Biewer is not a purebred Yorkie and finds it insubstantial to attempt breeding to a Yorkie standard. There are only a few lines that the parents and grandparents can be positively confirmed, the rest you have to rely on what appears on the pedigree. We believe beyond a shadow of a doubt that quite a few of those pedigrees are falsified. So, if you have not been privy to the mating of dogs you cannot affirm that the pedigrees are genuine."
I am not making any comments, decide for yourself how you want to interpret this. Have fun.