So one day I was riding the metro, and one of the many stray dogs that exist in Moscow got on at one of the stops. He walked up and down the cart probably looking for someone to feed him. Perhaps his owner died. Then it would sit at the door patiently while passengers got on and off.
So I was telling my roommate this and she said that I confirmed a myth that Muscovite dogs know how to ride the metro. She had heard that they knew how to ride the metro, but had never witnessed it. Well, now we all know, you and I both.