I feel that love often comes covered with fur. Sometimes the only love that people experience is the love of an animal. I don't believe these animals would remain with these homeless people if there wasn't an exchange of love going back and forth to each other. After all, if you are homeless there are no walls so there is always the freedom to leave. As long as both human and animal is able to have enough to eat and a place to get out of the weather I see no harm at all. In fact I would encourage it.