Here's my thoughts on a dog attack, which is probably worth what you paid for it.

1) They're often more afraid of you than you are of them. They try to make you think they're not. They're pretty good at it.

2) Don't miss. You could turn a dog thinking he's defending his territory into 100 lbs of really pissed off, pain-ridden cornered animal. Dog's posture, too.

3) As with every time you shoot, make sure of what's behind your target. I've found more dogs being pursued by their owners than solo.

4) You might want to have an alternate strategy when for when the dog is standing between you and a playground full of kids and you *can't* shoot. It might be this alternate strategy will work even when you could.