This. You are worrying about trained guard/attack dogs. Most of us are talking about family pets that have been raised with the kids that bark when a stranger comes around..
Not really. I'm not scared of having a large family dog.
This started out as a dog as a replacement for a gun. I don't need a dog large enough to potentially replace a gun inside the house with young children. I see one as an piece of overall security but one that is not right for my family at this time. I do think a dog is a much better deterrent than a gun that nobody knows you have and very likely couldn't pull out in a delirious, just woken state anyway.