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My wife and I carry a Photon keychain LED lights: http://www.photonlight.com/Photon-Micro ... hlight.htm

We worked on ships for years, and we were never without a light source "just in case".

I was working late one night in an industrial park that was guarded by Rottweilers behind a fence at the other end. They were barking at us as usual, but this time they sounded much closer, and I was afraid they might have gotten through the fence. I shone my little Photon light at them to see if I needed to run, and they yelped and ran away, cowed by my tiny light.