Thing is, if you make the big scary dog go away, you haven't done the kid any favors as far as learning to deal with life without deus ex machina intervening. You've also planted the seeds of how to get rid of something/someone they don't like . . . kids are quick to pick up that kind of lesson and run with it. Those kinds of lessons are part of the basis or our increasing mindset that it's always someone else's fault/responsibility, never our own. Why not teach the child a valuable lesson about how their actions have consequences? Not to mention lessons about respecting others.