Well, after working for a vet for a year, I decided against becoming one. I had wanted to be a vet for like 5 years before that mind. It just wasn't what I'd had in mind. I did learn however, that the vets who generally make the most money are the specialists. For example, in the racing industry, breeding specialists are sometimes hired for a specific stable and paid very well. They manage the breeding and study genetics in order to produce the next secretariat.
I've also been looking into publishing. If you publish a horse magazine or newsletter you can get pretty rich.