Actually, the similarity is not surprising considering that the walking robot was designed by Boston Dynamics—the same company behind BigDog. Petman has been in development for some time now, but this is the first chance we have had to view his human-like stride. The military plans on using it to test out protective clothing for soliders that need to be completely protective and not strain or open up under any sort of human articulated movement. It's capable of crawling, as well as walking at 3.2 MPH.
And like the Big Dog, it can keep its balance when you shove it.