The making of Yorkies or Yorkshire Terriers has been long disputed, and will most likely never be completely resolved. Most of the early breeders in England were illiterates, therefore the earliest breedings were not recorded.

Following are the three breeds that are given the most credit for the weaving of the Yorkshire Terrier, and are not disbuted for being part of their history. They are mentioned in a number of documents in their country of origin, which is England. Theories have also included the Waterside Terrier, and Skye.