The Horse at Play

Horses are mammals, and as such are all "warm-blooded" creatures, as opposed to reptiles, which are cold-blooded. However, these words have developed a separate meaning in the context of equine description, used to describe temperament, not body temperature. For example, the "hot-bloods", such as race horses, exhibit more sensitivity and energy, while the "cold-bloods," such as most draft breeds, are quieter, calmer creatures.[27]