The dogs are victims, too-of a neglectful owner. That said, predators are predators. perhaps some defensive measures would help- a 4 foot page wire fence with a strand of barbed wire above and below seems to do a good job keeping feral hogs and dogs away from our new home in Tallahassee. Having 4 dogs helps, too. On the more devious side of things, dogs are pretty easy to bait and poison-human iron supplements, raisins and grapes seem to be good choices.
Wolf and coyote problems are more often solved with poison baits than gunfire, I believe.