Diarrhoea is always an abnormal finding in the horse and an indication of a problem that could get much worse.
While a sudden and copious onset should be treated as an emergency, in this article Dr Sarah Van Dyk from WestVETS Animal Hospitals and Equine Reproduction Centre, discusses chronic, persistent, low grade diarrhoea in the adult horse, the type that is often described as: “always a bit loose”.