A type of stereotypical behaviour that is classified as a stable vice. The horse continually walks in circles or from side to side in its box. The origin of this behaviour is though to be boredom and/or lack of exercise.  

A slow four beat gait without a suspension phase. The footfall pattern is left hind > left fore > right hind > right fore > left hind ...

extreme form of paddling (dishing) where the horse places one hoof of a pair of front or hind hooves in front of the other in a straight line.