BigDog is the latest from the engineering geniuses at Boston Dynamics. BigDog is powered by a gasoline engine that drives a hydraulic actuation system. BigDog is approximately 3.28-feet long and 2.30-feet tall and weighs 165-pounds. It is about the size of a small mule or big dog.

BigDog has a computer built-in that controls locomotion. It is equipped with sensors that aid BigDog in adapting to varying conditions. The sensors provide stereo vision, joint force, joint position and ground contact that aids in continuous movement. Most importantly, the robot is equipped with a laser gyroscope that aids in balance under extreme conditions.