This section is from the book "The Farmers Ready Reference Or Hand Book Of Diseases Of Horses And Cattle", by S. C. Orr. . Also available from Amazon: The Farmer's Ready Reference;.
These two are the same in character, the different names only indicating the part of the foot affected. They are due to a dry and brittle condition of the hoof. They may be only very slight, causing little or no lameness; but sometimes they pene trate to the sensitive part of the foot and cause serious lameness.
Treatment. - The crack should be carefully cleaned out with a hoof-knife, cutting away the edge of the wall on each side of the crack, but not wounding the sensitive tissue in the bottom. A cut should then be made at a right angle with and across the top of the crack reaching into the quick, to prevent the crack from extending further up the hoof. A warm, flax seed meal poultice should then be kept on the foot, changing it once a day for a week. At the end of a week the poultice can be omitted and a cantharidine blister applied around the coronet; and the crack should be kept tilled with an ointment made of pine tar, one part, and tallow, two parts. The horse must be given complete rest and should not be put to work until the new growth is well under headway.