I walked into a customers yard today with her, and here comes her dog snapping and growling as fast as he can only to be stopped by the chain it was on. I've been here before and new that the dog was on a chain, but today I was armed so I started thinking about likely scenarios. What if the chain broke. The pathway to the house is only a few feet from where the dog chain stops and the dog runs at me like he has no chain on, what if the chain broke and the dog was on me, or there was no chain? Although I've never been attacked by a dog, I feel certain that I could eventually beat the dog into submission, it's a medium size mut maybe 50lbs., but I would certainly sustain some painfull injuries in the process. Lethal force on a dog? What about if it was larger, say a big male lab?