Why wouldn't you assess the dog first? Do some training before you just 'wing it' and see how it goes. This dog has been in a fight and killed other animals. On top of that, it's a staffy and call me 'breedist' but that is the number one breed likely and capable of killing other dogs. Think of the other dogs this dog could encounter. Think of being an owner of a dog that has badly hurt or killed another person's dog. As far as I'm concerned, even if there's only a small risk the potential consequences are too great for there to be any risk.