The stray dog ecosystem of Moscow
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I noticed a bit of this went I was visiting the ruins of Pompeii. Many stray dogs were waiting by the food court area but there were a few that followed us for the entire day. I'm not sure why they chose over everyone else but they did end up with some food.
It's possible that the strays that chose to follow us may not be allowed into the food court by the other dogs.
...they definitely do clean the city. They keep the population of rats down.
I wonder if the dogs have learned to relieve themselves in places more acceptable to people or if the people just tolerate it. Piles of crap on the train is not very appealing.
Recent discussion: the truth dogs reveal about evolution
Several also keep a regular schedule on the metro, riding at the same times and getting on and off at the same stops. I brought enough food to become friends w/ several whose schedule overlapped with mine.