Dog Loyalty Test

I like my dogs, but I'm not sure they have my best interests at heart. If someone was to break into my home and attack me, how will they respond? Of the 3, I'm only sure that one will attack. The other two will either bark a bit or run away. What if there was a service where someone in a protected suit breaks into your house to see how they react. I need to know I can depend on the mutts.