This affection appears as an irritable ulcer, and originates in a crack in the mucous membrane of the rectum, near the junction of the skin. It may be caused by intestinal irritation, piles, constipation, hardened fecal matter, and violent straining requisite for its expulsion. Pain is a prominent symptom, and a dog, so affected, while unloading the bowels will make continued efforts, desist for a time, and run about uttering sharp cries indicative of his suffering. This operation will be prolonged and finally accomplished after violent expulsive effort.

The discharges when solid are streaked with blood and sometimes purulent matter. When more soft they are of small size. On examination, the aims is found extremely sensitive, and the animal will struggle violently to esoape. Ether must be administered before the ulcer can be exposed. Suppositories containing one grain of each, opium and idoformum, may effect a cure, if not a surgical operation will be necessary.