This section is from the book "The Dogs Of Great Britain, America, And Other Countries. Their Breeding, Training, and Management in Health and Disease", by John Henry Walsh (Stonehenge). Also available from Amazon: The Dogs Of Great Britain, America And Other Countries.
Blisters are rarely used for the dog, because unless he has a proper muzzle on he will lick them off, injuring himself very materially. Sometimes, however, as in inflammation of the lungs, they are absolutely necessary. Iodine blisters to reduce local swellings may often be applied with a bandage over them, but even then, unless there is a muzzle on, the dog soon gets the bandage off, and uses bis tongue. The chief are cantharides, turpentine, sulphuric acid, mustard, ammonia, tincture of iodine, and biniodide of mercury; the last two having some peculiar effect in producing absorption of any diseased substance lying beneath. In all cases the hair ought to be cut off as closely as possible.
A mild blister:
25. - Powdered cantharides, 5 or 6 drachms. Venice turpentine, 1 ounce. Lard, 4 ounces. - Mix, and rub in.
26. - Strong mercurial ointment, 4 ouuces. Oil of origanum, 1/2 ounce. Finely powdered euphorbium, 3 drachms. Powdered cantharides, 1/2 ounce. - Mix.
Very quick blister:
27. - Flour of mustard, 4 ounces. Spirit of turpentine, 1 ounce. Strong liquor of ammonia, 1/2 ounce.
Mix the mustard with water into a paste, then add the other ingredients and rub in.
For bony growths or other tumors: 28. - Tincture of Iodine. Painted on every day, by means of a common painter's brush, or, 29. - Biniodide of mercury, 1 to l 1/2 drachms. Lard, 1 ounce.
Mix, and rub in a piece the size of a nutmeg every day, keeping the part wet with tincture of arnica, 1/2 ounce, mixed with half a pint of water.