were you able to get any video of it? It seems only too easy for the neighbors for you to do the shooting any they- nothing. They may even use the opportunity to get another dog. If you file a report with the police, work the leash/registration laws of your area- perhaps they can be brought up...
I definately like the electric fence idea!! I am sorry for all your trauma and losses. It is hard. The only light I can imagine is that the dogs definitely exposed a weakness in the set-up.... in such a bad way.
If you really enjoy chickens as I imagine you do, the electric fence really is...