Abstract: In order to train cutting horses, an artificial calf is mounted to: (1) swivel about a vertical axis extending therethrough, (2) advance and retreat, and (3) sweep back and forth in a horizontal plane. These manuevers are performed in response to signals from an operator who manipulates a pneumatic control mechanism. In the preferred embodiment, the calf is mounted to swivel on a platform which is attached to an extension projecting from a boom. The extension is selectively telescoped in and out of the boom, and the boom is selectively swept back and forth about a mounting pivot.