Quarter Horse: Working Lines
This type of Quarter Horse is doing exactly what the breed was meant to do: Work on the ranch. Though they don't really work on ranches anymore, they still perform the same work: Cutting, reining, herding, and much more. These horses are true champions: They have to be fast, agile, and smart. Most of the time, they even have a "cow-sense", an extra sense that seems to interpret what a cow is going to do before it does it, not having to rely on its rider to give it the cues.