_As their diagnosis is so difficult, whenever the dog-owner is in doubt, make certain by treating the dog not only by local applications but constitutionally as well_. In addition to good diet, perfect cleanliness of coat, kennel, and all surroundings, and the application of the ointment or oil, let the dog have all the fresh air possible, and exercise, but never over-exciting or too fatiguing. Then a course of arsenic seldom fails to do good. I do not believe in beginning the exhibition of arsenic too soon. I prefer paying my first attentions to the digestive organs and state of the bowels. The form of exhibition which I have found suit as well as any is the _tasteless Liquor arsenicalis_. It is easily administered. It ought to be given mixed with the food, as it ought to enter the blood with the chyle from the diet. It ought, day by day, to be gradually, not hurriedly, increased. Symptoms of loathing of food and redness of conjunctiva call for the cessation of its use for two or three days at least, when it is to be recommended at the same size of dose given when left off. There are two things which assist the arsenic, at least to go well with it; they are, iron in some form and Virol. The latter will be needed when there is much loss of flesh. A simple pill of sulphate of iron and extract of liquorice may be used. Dose of _Liquor arsenicalis_ from 1 to 6 drops _ter die_ to commence with, gradually increased to 5 to 20 drops. Dandruff.--A scaly or scurfy condition of the skin, with more or less of irritation. It is really a shedding of the scaly epidermis brought on by injudicious feeding or want of exercise as a primary cause. The dog, in cases of this kind, needs cooling medicines, such as small doses of the nitrate and chlorates of potash, perhaps less food. Bowels to be seen to by giving plenty of green food, with a morsel of sheep's melt or raw liver occasionally. Wash about once in three weeks, a very little borax in the last water, say a drachm to a gallon. Use mild soap. Never use a very hard brush or sharp comb. Tar soap (Wright's) may be tried. PARASITES--INTERNAL. WORMS. We have, roughly speaking, two kinds of worms to treat in the dog: (1) the round, and (2) the tape. (1) _Round-worms_--They are in shape and size not unlike the garden worm, but harder, pale, and pointed. _Symptoms_--Sometimes these are alarming, for the worm itself is occasionally seized with the mania for foreign travel, and finds its way into the throat or nostrils, causing the dog to become perfectly furious, and inducing such pain and agony that it may seem charity to end its life. The worms may also crawl into the stomach, and give rise to great irritation, but are usually dislodged therefrom by the violence accompanying the act of vomiting.