Some good suggestions! Perhaps look into Richard Schouten of Remount Horsemanship, a NH trainer who works out of my barn. I’m at this barn because 6 years ago I came on the advice of a dressage trainer I was working with at the time, whose dressage training/USDF “insider” (can’t remember her position) mother taught him lessons. Also, my 4-year old horse needed a behavioral intervention-he was an insecure mess and was borderline dangerous. He gained a deserved reputation. Richard teaches excellent groundwork exercises to gain confidence in horses and riders, and improve communication that translates to under-saddle work. He uses the same philosophy as you’d do when riding: yielding to pressure, paying attention to you, waiting for your commands, and you learning to reward by releasing pressure the moment the horse complies in order to “show the way”. Richard can teach groundwork to any breed and discipline, does lots of clinics, and is an excellent, upbeat teacher. He is, btw, the reason I still own and now really, really enjoy my horse. I still use the groundwork methods any time my horse “winds up”, and they are now routine enough that my horse can calm down with the familiarity of things. He literally now loads comfortably at the end of a longe line and understands that he’s working on the ground as well as under saddle and the work goes by the same principles. Check out his facebook pages for glimpses of his style.
I would not recommend Buck B. He’s good with horses but not people, unless maybe you’re young, skinny and good-looking.
PS, my dressage horse worked cows with this trainer, it was great!!! He was so much better (once he got over the cows, it took multiple occasions) than the QHs because I could put his body exactly where it needed to be to move the cows to a goal, etc, because of his dressage training. Thus, I could exquisitely direct the cows and the horse discovered purpose for the trained movements - he learned that cows move because of and based on his movement. He became very interested to do the work. Also, I was patient - because we wait seemingly forever while developing the horse. If you get the opportunity to work cows with your dressage horse, do! Your horse will likely be less bothered by anything s/he sees at a show or what you ask him/her to do in training.
so groundwork means in hand work, rider not mounted.