Farriery is the art of horse-shoeing. It consists in the attachment of a rim of iron, by means of nails, to the lower border of the horse's hoof, in order to prevent its excessive wear. Research Farriery
In horticulture, canker is a kind of gangrenous disease to which fruit-trees especially are liable, beginning in the younger shoots and gradually extending to the trunk.
In farriery, canker is a disease in horses' feet causing a discharge of fetid matter from the cleft in the middle of the frog, generally originating in a diseased thrush. Research Canker