Creosote, 2 drachms; linseed oil, 7 ounces; solution of potash, 1 ounce.  First mix the creosote and oil, then add the solution and shake.  Better to shave the hair off around the patches.  Kennels must be kept clean with garden soap and hot water, and all bedding burned after use.  From three months to six will be needed to cure bad cases.

Mange Proper is also caused by a parasite or acarus, called the Sarcops canus.  Unlike eczema, this mange is spread from dog to dog by touch or intercommunication, just as one person catches the itch from another.

The Symptoms—­At first these may escape attention, but there are vesicles which the dog scratches and breaks, and thus the disease spreads.  The hair gets matted and falls off.  Regions of the body most commonly affected, head, chest, back, rump, and extremities.  There may not be much constitutional disturbance from the actual injury to the skin, but from his suffering so much from the irritation and the want of rest the health suffers.

Treatment—­Avoid the use of so-called disinfectants.  Most of those sold as such are simply deodorisers, and, applied to the skin, are useless.  Nor are they of much use in cleaning the kennels.  Nothing suits better for woodwork than, first, carbolic wash, and then a thorough scrubbing with hot water and garden soap.

Some ointment must be used to the skin, and as I am writing for laymen only I feel chary in recommending such strong ones as the green iodide of mercury.  If you do use it mix it with twice its bulk of the compound sulphur ointment.  Do over only a part or two at a time.  The dog to be washed after three days.  But the compound sulphur ointment itself is a splendid application, and it is not dangerous.

(3) Skin Complaints from Vermin.—­The treatment is obvious—­get rid of the cause.

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.