[cstreit]

I think the invisible fence is a good idea. If you're feeling generous and want to help him feel generous, offer to help him install it.

I'd hate to hurt ANY dog but this one clearly has issues, whether from abuse of bad breeding, who knows. Either way it's a risk to you and your family.

What if your daughter was walking your dog when it happened and accidentally got in the middle you know? As much as I'd hate to make the guy get rid of it, that's close enough to personal danger to your child to warrant a strong action.

I do agree that talking with the owner first is a good idea before involving the authorities. Give him a chance to make it right, and to your satisfaction. If he doesn't, that is the time to take it up a notch. You may lose a neighbor, but gain some peace of mind.