Check out this crazy dog-like robot video made by MA-based Boston Dynamics. The idea is to use the robot in battle situations to transport heavy equipment through rough terrain. Looks like they really tested this guy out, getting someone try to kick it over and making it cross over a particularly icy patch of ground, then replaying both situations in slow-mo (not unlike an action film battle scene).
Now it looks like this 'BigDog' robot now has some competition from another Boston area company called Vecna. They are making a similar robot called BEAR that they promoting as "the robot that can save your skin." Unlike BigDog, BEAR stands on two legs. You can see for yourself on Vecna's website.