I've always had a strong interest in medicine, but for most of my life assumed it wasn't really an option for me - I didn't think I could cope with blood and guts and death. Heck, I got queasy just watching ER!
So after undergrad, I began my career in nonprofit animal protection, working on companion animal overpopulation issues. However, after a couple of years it became very clear to me that my ability to do what I really wanted in my career (promoting effective policies among private agencies, government agencies, and veterinarians) would be very difficult to accomplish as a layperson. However, as a veterinarian, I would be in a much better position to not only make a difference in the cause I was so passionate about, but also to influence others to do the same.