The above video is of the various tests and design that they went through. As time went on they found out what works and what doesn't. they stedily improved the design.
The above is an image of a test for BigDog to go into a building instead of the soldiers to see if BigDog is capable of servaling the biuldings. in the future this can save time, money, and lives so that the soldiers dont have to risk there lives to search random houses what may or may not have enemies that will shoot and kill them.
The above image is a soldier walking through a feild with a BigDog following them. Carrying the soldier's bags and other important stuff in the future.
The above video is about the team testing BigDog's reflexes. Some of the test include making him run on ice and being kicked to see how well it will balance.