Hiker1, that would only be possible if the dog were in a coma upon arrival. If one is really worried about them taking out your lone dog, get another dog and that'll turn away even more people.
Probably true. It' also highly unlikely that 5 somewhat-organized armed BG's are going to target your house anyway.
If they have recon'd your house, know you have protective dogs, they're probably not coming. If they know this and come anyway, there is something inside that they want pretty badly.