If I were a District Attorney, I'd treat a dog attack like the use of any other weapon - if you would have been justified in shooting or stabbing the attacker, than the dog attack should be justified as well.
One potential legal "gotcha" is what happens if the bad guy attempts to retreat. With a gun, you can stop shooting at that point (and frequently are required to do so by law.) But with a dog, unless you can command it to break off the attack *instantly* when the attacker starts to flee, you may have legal or civil problems.
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