A classic game like Duck Hunt deserves the classic Magic card frame. Duck Hunt Dog retrieves your dead birds. And I know every person who played this game wanted to kill that dog when he laughed at you. But you can’t, so I gave him hexproof.
Yes, I’m aware there’s some other, later games that do let you shoot the dog, (most notably the arcade version of Duck Hunt) but the flavor text is referring to the original game for the NES.