[jyl]

Keep calling animal control. Get your neighbors to call too. Eventually they will take action. If not, drugging or poison is an option, if there no other animals or children around. Edit: well, looks like poisoning a pet dog can be a crime, so that's a problem. I guess you'll have to resort to something more terrible than poison . . . lawyers . . . Seriously, the local authorities usually will eventually take action, especially if enough people complain.