I don't know how your town deals with dogs, and how your animal control officer is, but in my town, if a dog is unlicensed, there is a stiff fine. I'm betting that this bozo does not have his dogs licensed. If a nuisance dog is reported, the owner gets one warning, depending on the situation, then, the dog is impounded, and there are some stiff penalties. About 25 years ago, the penalty was $75. I bet it's more now. I wouldn't care if the neighbor got mad. I'd call the ACO and file a complaint right away, and not even wait for the dogs to come back. This idiot may wise up if he is hit in the wallet. If I had to resort to shooting, I'd shoot to kill. I love dogs, but a dog at large who is killing livestock is a PREDATOR.