Remi is my Great Dane. He lives for guarding. Even when given a comfy bed on the deck in order to nap, Remi feels it his his job to guard. Unfortunately in our subdivision there are a lot of things that Remi finds threatening and needs to warn off. Things like mothers pushing their babies in strollers down the sidewalk. And things like delivery trucks driving down the road. And things that I don't even notice and can't identify, but that must be threatening because Remi gives his best threatening bark.
Do your dogs make you feel safe? Would they guard your house if you weren't home? Would they be distracted from guarding by a bone or a piece of steak? Would they welcome all intruders to your home with a big lick and a friendly wagging tail? Or would they run and hide under the bed?