The yorkie never did carry the parti colour gene. Regardless of the claims of those that don't know the breed and claim the are purebred, they are not but the result of a mix getting in there.
Unfortunately, they have been accepted into AKC registration but that was based on the registration numbers of sire and dam and who knows where the mix happened? At that time, DNA was not able to be tested as it was today.
The Biewers also a parti colour Yorkie that come from Germany but not recognized by the FCI or the German Kennel CLub, have proven they were the result of a mix and have very little yorkie genes. It is on their website when they chose to have that information on there. |