Ahh, see, this is my favorite thing about veterinary medicine. So many things you could possibly do, along with the opportunity to change your mind halfway through your career and go in another direction! It's the perfect profession.
For example, my vet is mostly a large animal/equine vet, but he also is very proficient in small animal. As he's gotten older he's gotten a little tired of pounding out herd checks and teeth floatings all day, so he has cut back on that and now his major thing is as a veterinary real estate agent. He goes around the country appraising practices and their equipment and selling them. He also has his own line of supplements for various species, and is also researching his own dairy cow feed to increase the efficiency of dairy farms. You can literally do ANYTHING.
I've always had my entire life planned out. Since I was in elementary school, my plan was to take all the hardest classes in high school, do well, get into a good college, and go to vet school. Well most of that is done, and once I get into vet school, I'll have reached the end of my planning-I've never really thought of my life beyond vet school. And that is SO exciting! I really really love all things equine, but I also enjoy working with dogs and cats, and I have a special love for food animals. I could totally see myself working in a clinic, out of the back of a truck, or both. If I really, really think about it, probably my dream job would be to work at Hagyard Equine Medical Institute in Lexington, Kentucky. I'd either want to be a surgeon or work in their Sport Horse department. How cool would that be? Working with some of the best hunters/eventers/race horses in the world!