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.
Emetics are very commonly used in the diseases of the dog, and sometimes act very beneficially; but they have a tendency to weaken the stomach, and should therefore be used with caution. If not frequently resorted to no harm is likely to accrue, as vomiting is almost a natural process in the dog.
Common salt emetic:
44. - Dissolve a teaspoonful of salt and half a teaspoonful of mustard in half a pint of tepid water, and give it as a drench.
45. - Tartar emetic, 1 to 3 grains.
Dissolve in a tablespoonful of warm water, and give as a drench; following it up in a quarter of an hour, by pouring down as much thin gruel as the dog can be made to swallow*