With some of the replies you might as well whack em with your computer!
No but on a serious note, do the right thing and put him down so it does not happen to anyone else.
Your child is very lucky!
The dog just made his last mistake, now do what you have to wether it is at the vets or in the woods, be responsible. I know you will.
Good luck and remeber you are doing the right thing.
Peace Superfly