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Find dog trainers in your town and make an appointment to interview them. "Occupational Outlook Handbook" in most public libraries will also be helpful. Any career in the sciences means lots of college and high grades. If you are still in HS, take all math and science courses you can.
There is a number of options for animal training, it all depends on what kind of animals you want to train. There's dog training for those who want to train house pets good behavior. There's also horse training, which is highly sought after. You could train service animals, or animals in show business. If small animals aren't your thing, there's always training animals for shows like the circus, zoos, or at Sea World.