Why horses
The most honest feedback you will ever get.
Horses survive by reading intention. Their nervous systems are built to detect incongruence — the gap between what you are projecting and what you are actually feeling — because for a prey animal, that gap is information about whether it is about to die.
Which makes them an unusually exacting mirror. A leader who is anxious and pretending not to be, who is issuing instructions they have not decided to mean, or who is asking for trust they have not earned, finds out in about ninety seconds. No 360 review. No facilitator’s interpretation. No option of arguing with the feedback.
When you are distracted, inconsistent, or forceful, the horse resists. When you are clear, calm, and trustworthy, it follows. It is leadership with everything else stripped away.