Yes horses can totally be trained with voice commands. Yes it takes a bit for them to be trained in such a way, but it is very possible.
My horse knows what the words whoa, walk, trot, and canter are without any body cues or hand motions.
During shows when they tell you to walk, trot... etc... my horse sometimes will get ahead of me and go into whatever the announcer says (Which I have to be careful because the judges are watching haha).
My horse knows what the words whoa, walk, trot, and canter are without any body cues or hand motions.
During shows when they tell you to walk, trot... etc... my horse sometimes will get ahead of me and go into whatever the announcer says (Which I have to be careful because the judges are watching haha).