Glenn's got it pretty good, IMO. Attack is a no-no. Defense will almost always give you the greatest advantage and chance of survival, house-clearing the greatest disadvantage. And most doors, particularly interior doors, don't bother a bullet at all.
I like dogs as much as the next guy, but if the choice is dog or any of my poeple, well, all the people will have a nice funeral for the dog a few days later under the tree in the backyard. Dogs are easy to replace, getting a new daughter over here from Russia is tough!