In 1980 Lem Madden invented a remote control for a horse. The rider operates an electronic transmitter, and the horse is fitted with a receiver that controls the reins. Optionally the receiver can be fitted with a remote-controlled bat for striking the animal and a speaker for giving voice commands.
Who would use such a thing? “An elderly person may be physically unable to mount and rein a horse by himself,” yet need to control it in order to accomplish chores. And “there are those who desire to break and train animals, but who are unable to do so because of the hazards involved with such tasks.” Fair enough.