I think folks need to for the most part leave feral dogs alone unless they know the area very well. I've shot a lot of feral dogs in my life....I think my record was 16 in one month. It was usually worst when harvest was over and migrant workers were headed back to Mexico and decided to turn their pets loose.
The locals know who's dog is who's. Imagine how horrible it would be to shoot a feral dog and have the owner come running over the hill calling it because they were on a hike or something.
Most dogs I've killed I was doing a favor. They were thin, unhealthy and getting into trouble because they were starving.