I have 7 dogs; one of them is a pit bull, Billy is a good, gentle boy.
If any of my dogs (I love them all dearly) ever started to pull something like this; I would personally stomp them to death with a steel toed boot immediately.
I happen to believe that all dogs reflect the personalities of their owners.
Until they attack a neighbor for no damned reason.
Hope you have adequate liability insurance.
Try $5 million, minimum. Check the cost for this coverage...
Ask the guy who writes your household coverage.
There is too much pit bull attack history from nearly every state. Consider the number of communities that have implemented an outright ban.
You must ask yourself; is there another method of protecting what I have ?