Scholarships can come from a variety of sources, from local clubs to major universities. If you're a member of any horse-related organizations, they often have scholarships available.
I think the best thing to do is determine what you want to study, and then search for scholarships devoted to that. There are a lot of scholarships available for fields that are in high demand. But if you know what you want to do, you can look at organizations, and in some cases companies, that do that for scholarship opportunities.
I'll see if I can locate some good sources for you.