Regardless of whether the dog is half wolf or not, it is running loose in the neighborhood. There HAS to be laws against that and animal control are the ones to deal with dogs running loose. Without looking, I am sure there are leash laws and regulations stating that dogs much be secured on the owner's property. The dog was loose, got onto your property and killed animals on your property. Whether your chickens were legal or not, that doesn't change the fact that the dog has to be dealt with. On my property, the solution is SSS (Shoot, shovel and shut up) but I realize that not everyone can discharge a firearm on their property without raising a ruckus in the neighborhood. You have a dog running loose and killing animals. The authorities need to take action and it shouldn't take a lawsuit from you to get them to do their jobs.