Designated Driver?

Saw this on YouTube.  Sat there puzzled for a few minutes, unsure as to how I wanted to react.  Was I jealous that this cowboy purportedly lived in an area where this would be possible, jealous my horse would never consider doing this (unless I had a bagful of treats) or just puzzled as to whether or not this would still be considered drunk driving?  I mean, if I'm too inebriated to drive a car, I'm pretty sure I shouldn't be operating a horse, either...