_Symptoms_: Increased secretion of urine of a watery nature—great thirst. For a time the dog’s condition does not alter, but if the disease is not checked then he loses condition, the muscles waste, the legs become thin, the ribs prominent, and the abdomen distended as the result of the large quantity of water taken. This is a disease to which old dogs are particularly liable. _Treatment_: Limit the quantity of water given the dog to drink; for a small dog, say half a tumblerful[1] to a couple of pints for a large dog. Feed on dry food. For medicine, give from half a drop[1] to two drops of Fowler’s solution of arsenic in water three times a day before food. If this does not benefit the case, give from an eighth[1] to a grain of powdered opium twice a day in the form of a pill. Treatment is often unsatisfactory. =Diabetes Mellitus=: _Symptoms_: Large quantities of urine containing sugar are passed; great thirst, voracious appetite, and gradual wasting of body. The tongue is dry and parched, and is of a red-brick colour; coat stares, and the dog looks generally unhealthy. _Treatment_: Food containing sugar or starch must be avoided; meat given nearly or quite raw is the best diet. As to medicine, though it is practically an incurable disease, codeine does in some cases mitigate the symptoms. Of this medicine, give from a twelfth[1] to half a grain three times a day. After a fortnight or so the dose may be doubled. =Diarrhœa=: _Symptoms_: Frequent watery motions, which may vary in colour—white, slate, brown, black, and sometimes green—accompanied very often by great thirst and loss of appetite. _Treatment_: In most cases a small dose of castor oil at the commencement of the attack does good, and in many cases effects a cure. Should the symptoms continue after the effects of the oil have passed off, give from five[1] to twenty grains of carbonate of bismuth three or four times a day before food, or the following mixture:— _Recipe: The Mixture for Diarrhœa_: Laudanum, 1 drachm. Tincture of Rhubarb, 4 drachms. Peppermint Water to 4 ounces. From one teaspoonful to two tablespoonfuls[1] three times a day. Or the following pills may be tried:— _Recipe: Pills for Diarrhœa_: Extract of Kino, 1 drachm. Powdered Ipecacuanha, 12 grains. Powdered Opium, 6 ” Ex. cip. _q.s._ A sixth, fourth, half, or the whole[1] may be mixed and divided into twelve pills. One to be given three or four times a day. If the motions are very offensive, from two[1] to ten grains of salol may also be given three or four times a day.