Greyhound racing.
Flickr user <a rel="nofollow" class="external text" href="https://www.flickr.com/people/soschilds/">Alex Lapuerta</a> (Smiles for the world)
CC BY 2.0
Flickr <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/soschilds/312388115/">here</a>