What do we do with all the Throwaway Dogs?

In three weeks we've been flooded three times. We currently have every pen full inside the shelter with 6 dogs in crates. While I wonder if this is inhumane I have to wonder about where the dogs would be if they were not in our shelter. Poor mama dog who has just given birth came in without her babies. No one has come calling for her. Where are the babies? I dare not think that they were deliberately let go in the floods to "get rid" of the problem. Such a sad thing to think that people are so heartless and uncaring. They are, after all, just a dog I hear time and time again. Damn.