The word submissive can sometimes have an undeserved bad connotation. If we are talking about a bully who is forcing another person into submission and fear, yes, that is a bad thing, a very bad thing.
But when it comes to horses and their interaction with people, submission is not only necessary from a safety standpoint, it is desirable from the horse’s perspective.
Horses feel the most secure, content and untroubled when they have a fair and capable leader. When there are no questions, when roles are clear, when the (human-horse) pecking order is established, a horse is submissive, calm and content.
Once the partnership is established, often, all it takes is the touch of a hand to elicit that calmness.
Enjoy that good horse,