Members of the Biewer Club reached out to see if Mars Veterinary would investigate whether the Biewer Terrier was genetically distinct from the Yorkshire Terrier and put the matter to rest. Owners provided blood samples, and by October 2009, Mars Veterinary had identified genetic markers for the purebred Biewer Terrier after testing over 30 lineages and more than 100 dogs. The pivotal study confirmed the Biewer as a genetically distinct breed—a first in canine history.
