If this horse looks stressed, his trainer and owner look relieved
(LA Times Anaheim Ducks)

In the paddock, race trackers can be seen craning their neck, looking at how a horse is walking, how agitated they might be and noticing any kind of stress. It usually comes in the form of lathering, which occurs when a horse sweats. It´s viewed as something you don´t want from your horse. But...