Angel?

I'm not one for keeping dogs myself, I much prefer cats. But as the world gets more crazy, I think at some point I might have to pick one up after I have a way to feed him/her (I would prefer a she). She would be trained to attack on command and guard an area on command, and of course I would give her lots of big pats and brushes and walks. Most likely one of the strays that you find everywhere in the balkans. Probably I would try to select one that looks like she has bulldog jaws.