To answer your question, I would probably shoot the moose but not the dog. Big difference between a 1,500 lb moose barreling at you and an 80 lb dog. Also knowing what I know from my life in Alaska: If a moose is behaving that way it fully intends to stomp your a** into the ground. A dog behaving that way, in the vast majority of circumstances, is not going to attack you. If he was in such extreme fear of his childs life he could have simply placed himself between his child and the dog -- that would be a normal, healthy reaction on the part of any parent.