I just watched the last half of this short film on turner classic movies. Amazing - best horse and trainer bit I've seen, although cutting in the film may have made the horse out to be smarter than it actually is. The horse seems to follow any command the trainer gives her with almost no cues other than his voice. I saw the horse calmly stand on a small platform 4x4 feet or so on command, then neigh, rear up get angry and snap on command. Then it laid down on the ground on command, acted wounded and sick and then on command it would try to get up and fall back down. At the end, she let herself back into her stall on her own - lifting the latch herself. Definitely at the very least a very well-trained horse. The end voice-over claimed she understood upwards of 400 commands.