RE: How do you control neighbors dogs??
If you are so worried about getting charged with shooting dogs like that, then establish a paper trail first. If they have you on record as claiming that the dogs are on your property growling at you and acting aggressively, then i doubt that you are gonna end up in court if some of them end up dead in the long-run. "I felt I was in danger" seems to work pretty good when humans get shot.
Of course, all these worse case scenarios would require that folks actually know that you killed the dogs. Think discretion...