As others have said, YOU may not think there's something there but but there is. One of the best, no shock products I've found is a spray called Pet Corrector. It just makes a loud hissing noise. The dog hates it and now will shut up if I just pick the can up.
That said, what I often do is put a shock collar on Ruger before we go to sleep. I know many of you hate this idea, but I was able to reduce the voltage and while the dog feels it he doesn't jump or anything. After a few barks he stopped barking and now all I have to do is put the collar on him and he stops and won't bark again till I take it off.
Another thing that works for me, sometimes, is to acknowledge what the dog is trying to tell me. I may thank the dog for warning me, and I often look out the window. Sometimes the look out the window is all it takes. I read that yelling at the dog is much like barking which just keeps things going even longer.
