Riding in the back roads of Virginia in the mid Eighties, I climbed a rather steep road out of a valley. At the top of the incline was an old farm house with a bunch of people on the porch. Looked something like a scene out of Deliverance. Anyway, I'm half whipped from the climb, and all of a sudden a large black Lab mix comes tearing around the house after me. I tried to out run it until it got hold of my sock. My only weapon at hand was a frame pump, and I was able to wollop him a good one before he got anymore of me. After whacking him a couple of more times, he decided he'd had enough and left. The whole time the only thing coming from the porch was laughter. No one yelled at the dog to come back, etc. Several miles down the road I felt an urge to go back and use what was left of the pump on the hillbillies on the porch, but common sense and the fact that I would have been badly out numbered, won out. After this incident, a freind told me about the squirt bottle with an ammonia solution and I have had no dog problems since.