I tend to disagree with the fact that a dog has no soul. I was under the assumption that all living creatures, two-legged and four, have souls. As far as what I would do: more than likely I would remain on-scene and have another family member transport my four-legged-insurance-policy to the vet depending on how severe the wounds are.
That's one part that was not mentioned here as far as I saw (I could be mistaken too), but if the dog's injuries are not so severe as to cost him/her its life then yes I would. If the dog is on its last leg (so to speak) I would more than likely accept the fact that she's not gonna make it, make sure the BG no longer poses a threat, make sure my family is not injured in any way and stay at home! I love my dogs and (because they have a soul) I know they love me! They constantly prove their mettle in keeping my home safe and because of that I believe I already owe them my life due to a couple of incidents that, without them, could have been really bad! They will get the best treatment possible if needed!