The top video is of "Big Dog" from way back in 2009. After watching it you may enjoy viewing this excellent spoof (thanks, Prokke!).
In 2012 I posted the video of their "Sand Flea" -
Sand Flea is an 11-lb robot with one trick up its sleeve: Normally it drives like an RC car, but when it needs to it can jump 30 feet into the air. An onboard stabilization system keeps it oriented during flight to improve the view from the video uplink and to control landings. Current development of Sand Flea is funded by the The US Army's Rapid Equipping Force.Presumably, the "Sand Flea" will later be equipped with reconnaissance equipment and perhaps some lethal weaponry.
The latest iteration by Boston Dynamics is truly impressive:
Via Neatorama again (they were hard at work while I was blogcationing).
All of us are so used to seeing CGI in the movies that it's hard to realize that what is being filmed here are actual physical living breathing robots.