Mostly I want to wring the neck of the people who dumped them. I don't know what they were thinking! If the dogs had presented a problem, they should have been put down. If they couldn't do it themsleves take them somewhere and have it done. It may sound cruel, but the poor dogs end up starving and suffering before going wild! I think some owners think a problem dog just needs room to roam, and that a rancher will take them in. That almost never happens. Our collie is an exception, and we took her because she was a collie. Also, the park ranger who found he had had her a couple of months and knew how gentle she was. Ranchers have to have dogs they can trust, unless it's a puppie, most will not take in strays. There is usually a reason someone dumped them, and that is usually the same reason that makes them a danger to people and livestock. It's too much of a risk! So, they end up going hungry and hurting other animals, or people, before someone shoots them. It makes me very mad.
Wild animals can be subject to that kind of attrition and I find it unpleasant but tolerable, but for domestic animals we have already intervene in their fate and I think we have the responsibility to use more humane methods of population control.