Catch dogs typically are American Pit Bull Terriers and their crosses, the Catahoula (dual purpose), the Dogo Argentino, a dog used for the same purpose in South America, and American Bulldogs; the first of these has been put back to work as a utility breed over the past 30 years and its tenacity on the hunt and undying loyalty to protect its master have made it a popular asset. The method of hunting has little variation: usually, the hunter sends out bay dogs trained to run down the pig until it tires and then the bay dogs corner it. After that, the much bigger catch dog will be turned loose to bolt after the pack, searching for it and once it has found the hounds, the catch dog will put itself between the pack and the (often enraged and very aggressive) hog. It will dip, duck, dive, and dodge the tusks until it can get a hold of the beast, pinning it or biting its ear. It will wait until the hunter arrives to kill it; the dog usually is wearing a Kevlar vest to keep it from getting gored, but scars to the face sometimes can occur.