''Jarred Up'' horses - observations by a racecourse farrier

At the height of the flat racing season how many different terms are used to describe horses that lose their action? The description depends very much upon those that are explaining the condition and what is perceived to be the cause and the effect; the animal simply becomes scratchy and non free flowing in its movements. The exciting cause reveals itself as being “JARRED UP.” At this early stage no observable foot specific secondary condition is presented.

Peter Baker (European Trainer - issue 19 - Autumn 2007)