People need a sense of purpose. They need the feeling that they have reasons to keep going. Often that sense directly impacts longevity.
Animals can reflect the same overall need, but in a very different way than humans. Horses don’t understand the concept of ‘gratitude’ by humans for their services, the real meaning of the satisfying ‘good boy/good girl’. But horses keenly understand ‘herd acceptance and value’ because it is critical to their survival.
Especially for younger animals with vigor, that vigor is bursting to do something. Gallop around in the pasture with the young herd members. Practice doing vigorous things like bucking and jumping things, that give them a feeling of satisfaction.
Also – vigor, purpose and belonging, through a ride when the horse understands the rider’s way of asking, and absorbs the expressed gratitude of the rider as ‘belonging’. A ride where the horse instinctively perceives a common purpose with the rider. The rider is contributing to knowing where and how to go. That’s critical input. The horse is contributing to their safety and success by executing with their strength and perhaps their speed. The herd of two accomplishes a successful purpose.
I’ve read that one reason that horses and dogs take so well to domestication, when other similar species do not, is their strong instinctive recognition of the value of the herd or pack – and of their individual value in the herd. That sense of purpose, that they get along with others, that the herd wants them. A connection not just to the herd as a whole, but also between individuals in the herd, that is more than many other herd species express.
So, imo, that’s the connection that has horses and riders/drivers/partners working together in a common purpose. Equine pasture ornaments are the byproduct of that connection.
Joining the horse’s sense of vigor and connection with human purpose has created a place for horses to exist in the world.
If humans were not interested in the connection with horses, most horses wouldn’t exist at all. Horses wouldn’t be here in the flesh, wouldn’t appear in art, books, movies, things that inspire people to a horsey-life.
Humans keep the equine species going because humans maintain that purposeful connection, a thing that is integral to being a horse.