If nothing else, this photo of George Pepper’s “Four Team” proves that horses were trained to do more than one task. Yes, those are, in fact,┬áchampion jumpers in harness.

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"Bit & Spur contends this should be called a quadrem. Leader high stepper, Dr. Sherman; second Glendale, champion saddle horse; third Rupert, champion high jumper season of 1903; wheeler, Senator, champion high jumper season 1904. Taken in Queen's Park, Toronto. Fred Bork driving." ... from the May 1905 issue of Bit & Spur