I am sorry but I have read everything you have said about pitbulls not knowing when to release their bite. Tht is not always true. My dad had a pitbull that was his baby. We had someone break into our house when I was about eight years old . The person broke in through my bedroom window. Harley was sleeping in my bed. She knocked the guy down and held him there. But she never broke the skin.As soon as I got my dad. All he had to say was come.She let go immediatly.She went and sat by him like it was no big deal.He wasnt a professional trainer or anything. She was just a very well trained baby..