We had a pitbull  years ago...His name was Homer.....He was probably the best dog we have ever had....I never had a qualm about him at all....We miss him terribly....And then we also had a girl named Annie that was the meanest nastiest little girl I ever saw....I totally believe that each dog is different...And training...training...training is the most import rule of thumb...   
I would check with a trainer and a vet and get their opinions...And then follow your instinct....lol...Alot of help  huh...   
Joyce        
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