This is the latest update on the Big Dog or the Legged Squad Support System (LS3). Sensors and a touch screen is now mounted on the front of the robot with a rounded base to allow it to better recover from a fall or rest position. The Dog now has a LIDAR and a stereo camera that allows for better perception of the environment and the people around it. to With the added hardware, the robot is now able to perform human following and it should be moving towards making decisions that will make it more useful than a mule. Another improvement is that the robot is now quieter than the older version. This is a really stable platform for the given environment. Kudos to Boston Dynamics.
These slides give an overview of the Big Dog.