I have been horse crazy for 60+ years. For reasons too involved to go into here I have always had a special attachment for the "problem" horse.
For over two decades I have been helping people and horses around the world quickly past attention, trust, fear and respect issues in private work, clinics, web pages, videos and ebooks.
Traditionally people bring horses from a herd setting geared toward the individual's needs into a social setting geared toward the needs of the group. This results in a "happy medium" relationship - as long as neither party does anything the other can't live with, they're fine.
When they can't work out a suitable happy medium, the horse gets replaced.
I teach people to control their horses by going into the horse world and quickly connecting with it there using the horse's natural dynamics then bringing the horse into the human world along with its natural dynamics.
The "happy medium" relationship is replaced with a connected, communicating relationship. Because the horse knows what is expected of it and knows it can do what is expected of it, the relationship is never broken.