Causes: faults in diet, musty food, foreign bodies, poisons, lack of sunshine, retained fæces, parasites, ill health, chronic diseases, icy bath, septic drink. Symptoms: irregular appetite and bowels, fever, foul breath, red tongue, tartar on teeth, dullness, prostration, vomiting of mucus or bile, tender epigastrium, arched back, fœtid stools, emaciation. Treatment: regulate diet, sunshine, pure water, scraped muscle, soups without fat, antiseptics, calomel, pepsin, muriatic acid, strychnia. _Causes._ The irregularity and variability of the food, overfeeding, highly spiced foods, putrid or spoiled food, musty food, the swallowing of pieces of bone, and of indigestible bodies, the consumption of poisons, the absence of open air exercise, the compulsory suspension of defecation in house dogs, and the presence in the stomach of worms (spiroptera, strongylus), are among the common causes of the affection. As in other animals, ill health, debility, lack of general tone, and chronic diseases of important organs (liver, kidney, heart, lungs) must be taken into account. The plunging into cold water when heated and the licking of septic water must also be named. _Symptoms._ Appetite is poor or irregular, the nose dry and hot, the mouth fœtid, the tongue reddened around the borders and furred on its dorsum, the teeth coated with tartar, the animal dull and prostrate, vomits frequently a glairy mucus mixed with alimentary matters or yellow with bile, and there is constipation alternating with diarrhœa. The epigastrium is tender to the touch, the back arched, the fæces glazed with mucus or streaked with blood, and offensive in odor. Emaciation advances rapidly and death may occur from marasmus. _Treatment._ Adopt the same general plan of treatment. Stop all offensive and irritating food, give regular outdoor exercise, free access to pure water, and every facility to attend to the calls of nature. Give plain easily digestible food in small amount. In the worst cases pulped or scraped raw meat, in the less severe mush, or well-prepared soups with the fat skimmed off, and bread added. Check the irritant fermentations in the stomach by salol, bismuth, salicylate of bismuth, or naphthol. In case of constipation give 8 to 10 grs. calomel. Then assist digestion by pepsin (5 grs.) and hydrochloric acid (10 drops) in water with each meal. If the bitterness is not an objection 1 gr. nux vomica may also be added. ULCERATION OF THE STOMACH.