Which group of dogs is mentioned as part of the crossbreeding that developed the Rat Terrier in the late 19th/early 20th centuries?

Answer

English White Terrier and Fox Terrier

The breed was developed from crosses including the English White Terrier, Fox Terrier, and possibly some small sight hounds.

Which group of dogs is mentioned as part of the crossbreeding that developed the Rat Terrier in the late 19th/early 20th centuries?
DogpestbreedcompanionRat Terrier