there are not many careers to do with animals that actually support an abolitionist way of life and philosophy.
I dont think we should be suggesting working in pet stores either especially after that ordeal on facebook with the bunnies...
working as a vet nurse can be very satisfying as you are working directly with animals to help them overcome illness and lead a happy life, but again it is working on the premise that people have the right to own a pet, pets that most people see in some way as property, and also that the pet owner has the right to do certain things to the pet for its perceived wellbeing. we cant really ask a pet if it wants to be neutered or have babies, or how it feels about being groomed and what style of groom it would like.
the best we can do is to talk to other people about ideas on animals and their use in our current life and how we can aim for a better world, and so I agree with everyone about becoming animal lawyers, politicians, philosophers, activists, writers and artists, etc.
Becoming an example for people to look up to is one really big thing. If you show people it's possible to live a life without using animals it's a big way to convince them of its virtues and practicalities.