The Toy Fox Terrier is a small terrier breed of dog, directly descended from the larger Smooth Fox Terrier but since 1936, it has been registered in the United States with the UKC as a separate breed.
Image credit: Terry Best, CC BY-SA 3.0
Adapted from Wikipedia, CC BY-SA 4.0 — https://en.wikipedia.org/wiki/Toy_Fox_Terrier