Is he fixed would be my first question, and please dont adopt him out until he is. Next how old and do you know anything about his back ground? Most amstaffs that I have had dealing with are not very "bad word" (game) and get along well with other dogs but not all are the same and you dont know what his back ground may have been or if he is a mix with a more aggressive dog. I would also suggest having a breaking stick and knowing how to us it if you are going to be introducing unknown dogs to other pets. It is a good thing to rescue but please be aware of the dangers and how to avoid them, most bullies are the best animal a person could ever have but when confronted with the bad you should know what to do. I rescue and have learned some lessons the hard way, its not pretty and my heart has broken but at least now I know and I still love the breed. The breaking stick brings out emotions in some people but they must not have had to seperate a bully from another dog before, if the dog is (game) he will hold on for life and yelling, kicking, hitting just wont work, be safe not sorry. Good luck and thank you for helping the breed.