I Got Some Pit Bull Issues in My Neighborhood

If I am on my property and a pit bull comes charging at me, am I allow to respond? My stance is if it can charge at me, it can charge at my wife and my children. Do I have to wait for it to bite me or is a charging towards me enough? I ask because I am concerned based on the owner's aloofness and the fact that it can jerk around a 250 lbs man and it still has balls.​Here's a case where there was an actual attack so not really similar to the situation that I made up.https://on-ajc.com/2Jny20r via /r/CCW http://bit.ly/2LYWXt9