A modular harrow apparatus for smoothing horse pens includes a vehicle carabiner that attaches to an ATV, a UTV, or a small tractor. Each of a pair of chains has a vehicle end coupled to the vehicle carabiner and a harrow end. A lead harrow bar has a pair of first front eyelets coupled to the pair of chains and a pair of first rear eyelets. A second harrow bar has a pair of second front eyelets. A pair of linkage systems is coupled between the pair of first rear eyelets of the lead harrow bar and the pair of second front eyelets of the second harrow bar. A plurality of tines is coupled to a first bottom face of the lead harrow bar and a second bottom face of the second harrow bar.
