An automatically resetting rodeo barrier training and desensitizing device. This device is constructed to train horses to properly act with respect to rodeo barriers in performance of certain rodeo contests, such as, by way of example, steer roping and calf roping. The device further trains horses to be accustomed to stimulation to their legs and bodies so that the horse will not succumb to panic or a flight reaction. A barrier arm makes a makeshift rodeo barrier, which rotates about the support member allowing the animal to pass through. After the animal has moved through, the barrier arm is returned automatically to resting position.