Little things No DRF tells you about

Horsin~Aro

American Pharoah’s Jockey’s Whip Might Have Cost Horse Preakness Contention | Horse Racing | NESN.com

DiscreetCat

I don't think whips should be used at all. I've seen several good horses that don't to it anyway (Serena's Song being a prime example). I doubt that they're even necessary, for anything other than just getting a horse's attention.