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Careers similar to training horses. Dog trainer, not sure it makes much money though. Farrier, breeding technician, riding instructor, large animal vet tech, livestock auctioneer. Some are not common in some regions, but that what I could think of.
I used to raise pigs for FFA in high school and had the same thoughts you are having. I ended up studying Agribusiness at Cal Poly and have found a great job that is still ag related, though not what I thought I'd do. Have you considered being a vet, working on a dude ranch, or a related field?
There are other opportunities out there that may not be what you are thinking, but something that would make you fulfilled and happy.