I understand what both sides of this arguement are saying. But, I would say that it is the owners fault if the dog is running all over PRIVATE land and not being controlled. Happens once-maybe twice- let it go. Tell the owner if you know him. Third time on my land BOOM! dead dog. The owner needs to control their dog and be responsable enough to keep track of that animal. If the dog is just wandering down the road, leave it alone. If it is killing or chasing animals - and you have seen this - it needs to be shot because it won't stop a habit once it has started and hasn't been disciplined-it doesn't know what it is doing is wrong. On public land, call the DNR and let them take care of it.