An employee was riding a horse in the bud box near shipping pens and was helping a trucker load cows onto a livestock trailer. Two cows were being loaded into the nose of the trailer and a third cow tried to follow. The employee went to stop the third cow. The cow pushed the horse (and rider) down an alleyway. The employee's boot spur caught on the cow and his right leg twisted, resulting in fractures to the fibula and tibia.