Vet seems to be more trouble than it is worth in the long run. I wanted to be one for the longest time, but it was seriously a pipe dream for me. Also, if you have my luck, large animal veterinarians only make about $45,000 a year around where I live, even though Tennessee has livestock everywhere.
Basically, if you want a high paying, active job with animals then you are going to have to go to school for quite a few years unless you get lucky. Otherwise, you are looking at dirty work and a low salary.
If you have an interest in wildlife, you should look into zoologist/wildlife management. They study these species and try their best to help the endangered species. You'd get to travel lots of different places and learn about more species of animals than you could imagine. I have a cousin that does this, and she has absolutely fell in love with this job. I believe she told me you start off not making very much, but then with experience your pay increases to a fair amount. You need a minimum of a bachelor's to do this job.
Also, you should look into humane law enforcement officers a.k.a animal cops. You would be helping animals in such a tremendous way.
Red Money Maker (Red) - 2004 Sorrel QH Gelding