The Toy Fox Terrier is an American breed, developed in the early 1900s by crossing small Smooth Fox Terriers with toy breeds. Farmers kept them as barn ratters, and their quick wits later made them circus favorites. Adults weigh only about 4 to 9 pounds, with a satiny, mostly white coat, a black, chocolate or tan head, upright pointed ears and a high-set tail.
Many are bright, playful and devoted, with plenty of confidence for their size. They can also be bossy, barky and quick to chase anything small that moves. In San Diego, that means a secure harness on canyon walks, where small animals dart across the trail, and a close eye outdoors, since coyotes share the city's urban areas. Dogs vary, so spend time with the one you're considering.