Nicknamed "AlphaDog," the prototype is the latest from the minds behind a four-year undertaking called BigDog, that's being developed by Boston Dynamics and funded by DARPA and the U.S. Marine Corps. AlphaDog is officially called "LS3," or the Legged Squad Support System.
Check out a video demo below. As you can see, AlphaDog can walk and trot over sharp rocks, albeit rather slowly. Escapist Magazine says it will take the robot 24 hours to cover 20 miles, though no re-fueling is needed. Clearly AlphaDog is designed more for walking alongside troops rather than outpacing anyone.
The video also shows two grown men pushing AlphaDog off its course, and once it does, the robot immediately resumes its original path. It can even get up after being knocked down. Pretty cool stuff.
...and now for some cool viewing: