When do dogs become protective?

I was just wondering at what age do most dogs become real protective of their owner, like in the sense that she would fight someone if she thought you were in danger. I have a 10 month old female pit and i was just wondering. I've never had a case were I need "protecting" I was just wondering if its a... show more I was just wondering at what age do most dogs become real protective of their owner, like in the sense that she would fight someone if she thought you were in danger. I have a 10 month old female pit and i was just wondering. I've never had a case were I need "protecting" I was just wondering if its a natural thing. I know she loves me cause she only listens to me and I must admit I treat her like a baby.
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