The classic is back with real grass, music, and sound effects. Would horse hooves be silent? I think not. Anyway, add some realism with the following sound triggers, type in any of them and hit enter. You can do them all at the same time, no harm. The hoof sound loops, so if it bothers you after awhile, reload scene and just don't trigger it. It's soft thuds, on grass, since your on grass.
Sound Commands:

sound (for some nice adreneline pumping, heroic, charge into battle music)
horse (for thudding on grass horse hooves)
thunder (well it's pretty obvious...)