The effects of remedies on the dog are nearly the same as on man, so that any one who understands how to manage himself may readily extend his sphere of usefulness to the dog. On the other hand, horses require a very different treatment, which accounts for the ignorance of the diseases of the dog so often displayed by otherwise clever veterinary surgeons, who have confined their attention to the more valuable animal. Some remedies affect the dog differently, however; thus laudanum, which is a very dangerous drug in human medicine, rarely does harm to the canine species, and treble the dose for a man will be required for the dog. On the other hand, calomel is quite the reverse, being extremely liable to produce great irritation on the lining membrane of the dog's stomach and bowels.