if he has a gun and he is breaking into your home he is ready to use it.12 gauge shotgun and a big dog are best for home defense. If the barking doesn't dissuade a break in..then the clac clac of the 12 gauge definitely will.
No need to even shoot.
Or you just warned an intruder you are armed, and if the intruder is armed then he may just start top open fire indiscriminately.
Yes..just what every "intruder" wants..a gun battle.