The aggressive is in there blood line yes the can be gentle pets. But its there nature to bit and what is there jaw pressure like 3600psi. I've got two friend with pits and there are very nice behaved dogs. But who know what might make them turn on someone or something. And I sure ain't going to be the one to find out what trips there trigger. I have owned 4 full blooded ST Bernard's and they say there a gentle dog ha ha. 1 was very protective of me he wouldn't even let my mom get with in 10 feet of me. And I could never break Joe from being so protective of me so he had to go.:scared: