Weird dream about my friend getting attacked by a dog and then turning into a butterfly?

she got chased by an alsatian and then it grabbed her and closed its jaws around her neck, nobody was doing anything and i was kicking the dog trying to get it off, when it let go i called her an ambulance and when the ambulance arrived she turned into a butterfly :s then one of my friends stabbed the dog in the heart. what does this mean? its random as hell.