Condolences to the family That is simply horrible to have happen. I would not own one and we've always had dogs. I don't think they have a off switch. I dont trust Rotties either. Only dog I have been bitten on was a neighbors German Shepherd and I'd have one of those again. She bit me and let go before I even realized what happened I've seen a pit hang from a tire jaws locked for minutes on end. To be fair that breed attracts dumb asses to begin with. There is always a "bad dog" breed the wrong people go out and get I remember in the 70's80's Dobermans and Rotties were in fashion .