I was walking my Pit mix one Sunday afternoon, and we passed a pickup truck with it's windows open, parked along the curb. A few seconds after we passed it, I heard a "Huff!" behind us and a very large German Shepherd was about 6 feet behind us, going for my dog, who never wanted to, or really did, start a fight in his over 14 year life. As usual, my dog didn't respond right away, just taking damage and looking confused, and I was very lucky to get my hand clear of the GS's mouth, as he tried to bite me as I tried to grab him and pull him off my dog. I had no weapon except a pocket knife, and about the time I actually thought about using it, my dog finally "Went into Popeye mode", where he literally looked totally different, from a Golden Ret type face to a Pit face, and the GS found out he had made a mistake. I never saw a dog that he couldn't handle once he "got out the spinach can". The GS finally bailed out, and round one was over, both had bites to the neck, so it was a draw. The GS's owners came out, and he seemed to think he had backup coming, so he came back for another attack. I tried to kick him as he passed me, but I missed, and my dog at this point didn't need any help anyway. The GS wound up going to the Animal ER for a whole lot of stitches, and my dog came out of the second round with a couple of holes in one ear, and the neck wounds from the previous round. The GS had finally picked a fight with the wrong dog. I carried pepper spray, and for a while, I carried an "automatic knife", even though they were (maybe still are) illegal here. Better I get fined/whatever than have a dead or seriously injured dog or myself. If I would have had a carry permit, I would have had a .38 5 shot of some kind, with a 3" barrel. Almost totally reliable, and a .38 would probably persuade almost any dog to bail out and get out of there. A friend of mine had a C02 pellet gun that with a single shot to the neck, stopped a neighbor's Rottweiler from attacking his Beagle on a walk one morning. The one in my neighborhood took pepper spray and was kicked in the ribs and in the face and still kept coming for another neighbor's Jack Russell. The owner's son came out and managed to just barely stop him. He had 3 broken ribs and a tooth was knocked out, and he didn't care.