There is an equine science program at my college. I've only seen the riding majors, but I'm not impressed with the riding and training techniques at all. You could learn just as much being a working student under a decent trainer.
OP, here in my province, to be an equine chiropractor, you have to be certified. The chiro I use and have know for decades, teaches this and massage and is accredited and has the authority to certify her students. She also has them apprentice with her as part of her program. I think her course is around $6000 to $7000, but being one of her students in this province, you are golden, you won't have trouble finding clients.
Equine Science degrees are for people who are already established in the horse industry and are expanding their knowledge, for a tax write off. That's it.