If you’ve got a potentially lethal dog charging at you, at what point can you defend yourself?
Who said it was charging? It would be interesting to find out whether the dog was shot in the front, the side, or the back.
I would kick it in the throat. Of course if I had a gun, I might fire it just to scare the dog away. Again, this is not a big dog. Looks like some sort of beagle mix to me.