Don't let your dog be protective around you or your family or even your other dogs, its just not necessary.
One of the things that owners struggle with is family dogs being protective, what started out as possibly cute, has turned into outright aggression and many times towards an immediate family member.
Having a well behaved dog that listens to you is all the protection you need from your dog. Being a great member of your family who does not look at everything as a threat and act on it.