My Hero

I think I want to adopt our foster dog. He is a really nice dog--calm, great with kids, smart. He was brought to the Northwest from Georgia where he was scheduled to be euthanized. He doesn't act like he has been abused but he has had trauma in his life. He has a big wound on his back. Hair isn't going to grow there again. It looks grotesque. People look at me strangely when I take him for walks, so I keep his back covered when I am out with him. My only problem is I can't tell if he wants to kill our 2 cats or just play with them. I don't know how long I want to live in a divided house, constantly making sure doors are closed so Hero can't attack the cats. I don't think the cats are happy about it either!