This is a two part series on horses. It is about a year old, but I only watched part one last night. I thought the part where a young colt was "broken " was fascinating. The entire episode was great, but the colt breaking is a really good watch. Start at the 39:00 mark to get a little back story. Start at 41:30 to see the cow hand do his magic with the colt.
https://www.pbs.org/wnet/nature/equus-story-of-the-horse-episode-1-origins/17063/