Is this real? How can this be real? I sort of get how they did pong, but how did they do the walking sheep? How do your herd just one color of animal?

Time-lapse and editing, I think.

I think with very very intelligent dogs. Hey it's like programming, do it enough for long enough and you get very very good at it. Do it for longer and then you start fiddling about with it until it breaks. Then do something different.