This condition, which is very well known to horsemen, is another of the ill-defined affections of the nervous system. The condition is indicated by spasmodic movement of the muscles of one, sometimes of both hind-legs, and occasionally one or both of the fore-legs. The effect of the spasm is to cause an extraordinary jerking upwards of the affected extremities, after which the foot is brought forcibly to the ground. The disease differs from chorea, as the symptoms are only developed during progression, whereas in chorea the muscular spasms are constant even during sleep.
In some cases stringhalt is only exhibited occasionally and under special conditions, as when the horse is made to turn sharply round, or when observed while quietly moving in his box, but it generally becomes more pronounced as the animal advances in age or when he is excited. No treatment has been found to be effective in controlling the muscular movements.