Olympics day 8

So what Olympic sport suits a pack of four dogs? All kinds of running, of course.
Running one way:

running the other way:

and running all ways at once:

Things were going just fine until we tried to organise a proper start. Time after time, a certain young Airedale boy with fast-twitch reactions kept doing false starts:

 The starter man had to step in and read him the riot act. One more false start and you're out. Okay, okay, I'll be good, says Digger.

Oops.

D is for dog.
D is for Digger.
D is for disqualified.