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Uh what kind of dog?
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The worse dogs you would want to be attacked by probably range from Mastiff (take your pick of variety), Wolf Hybrid, Argentian Dogo, Japaneese Tosa Inu, Rottweiler, large German Sheperd, Great Dane, to name a few.
Unless you were some sort of bear wrestler you would need a baseball bat or a knife at minimum to defend yourself against these.