Bush hogs are heavy-duty rotary mowers for thick brush and overgrown vegetation. Commonly called a brush hog or a brush mower, it is built to chop through dense undergrowth, small trees, and cut grass. Bush hogs are usually towed behind tractors or other heavy-duty vehicles, but some bush hog blades are self-propelled. Unlike finish mowers, the bush hog blades are thick and can cut through tough vegetation and handle larger obstacles like sticks and rocks. The cutting height of a bush hog may normally be changed to fit varying terrain and vegetation densities. Landowners with lots of brush and undergrowth should use a bush hog.