First, it's the mother's fault who decided not to hold on to her child that she put on the railing... It's like standing up on a water slide, falling, then blaming the officials for getting hurt.
Second, the animals were acting normally. If you throw a hurt animals at a pack of canines, then expect them to attack....
The animals probably won't get put down. If they do, then any animal which may attack human beings will have to get put down.