I'm guessing you want to make money off of it? For that, I have no idea, but I have a friend who is a pro. trainer so I can ask next time I see her because I'm interested now! I only know how to become one for volunteer, which is what I'm going to do. I'm just joining a dog training club and I will take a few classes on training and will be teaching once I turn 18 (I *think* I have to be 18, but I'm not sure actually).