Robots pull a Christmas sleigh to show what they can do

Three robots have been pulling a Christmas sleigh to show what they can do.

Google's Boston Dynamics unit made the BigDog robots to demonstrate how they can be used to transport goods around the country.

The four-legged machine can stay standing even when its creators try to kick it over.

They named the first one Spot, and they're designed to be used both inside buildings and on rough ground.