Once going home going to the entrance in front of me were 3 women and one of them was with a dog came to a small Elevator and for this reason I was left to wait for the next missing women before, and when the doors were closed, the dog managed to run out from the Elevator.I managed to react and quickly cut the leash otherwise the dog was strangled. A woman in tears came down the stairs and thanked me heartily.I understand that you have to do is always selfless can be and I ever needed help.