You may have heard of dog agility courses and you've surely heard of mice in mazes; but have you seen the two combined?
Two things ran through my mind while watching this: 1) How the heck does that li'l critter know which way to go, and 2) how long did it take the trainer to make all that stuff? Speaking from modelbuilding class experience, that there is a crapload of cardboard, and I guarantee there's like four X-acto blades (and a band-aid or two) in the garbage.

"I'm not impressed--let's see that little bastard make a souffle."
via makezine
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Comments
It has to have something to do with those small pellets. Maybe they smell or something and make him not want to go toward them.
I think those small pellets are poop