This is a term applied to all simple purging in which the faeces are liquid. It may be a natural effort to discharge from the bowels anything obnoxious to them, or to the system generally.

Horses that are not well "ribbed-Tip," and those of a nervous temperament, are particularly prone to diarrhoea; they are difficult to keep in condition, but will sometimes do very well if kept on good food and at slow work. When nervousness is the cause in hunters, allowing them only a small quantity of water before going out answers in many cases.

If due to indigestion or some irritant, a mild aperient, such as a dose of linseed-oil, will often effect a cure. In all cases the diet should be changed. For acute cases a mild astringent, as prepared chalk combined with opium, will be necessary; and if there is much weakness, stimulants should be administered. Catechu is a good astringent. Oil of turpentine and opium, beaten up with eggs, has been found very useful in many cases.