in the hind feet. It
nearly always attacks the inside quarter, but may affect the outside,
the band in front, or the heel, where it is of but little consequence.
It consists in the inflammation of a small part of the coronary band and
adjacent skin, followed by sloughing and suppuration, which in most
cases extends to the neighboring sensitive laminae.

_Causes._--Injuries to the coronet, such as bruises, overreaching, and
calk wounds, are considered as the common causes of this disease. Still,
cases occur in which there appears to be no existing cause, just as in
the other forms of quittor, and it seems fair to conclude that subhorny
quittor may also be produced by internal causes.

_Symptoms._--At the outset the lameness is always severe, and the
patient often refuses to use the affected foot. Swelling of the coronet
close to the top of the hoof causes the quarter to protrude beyond the
wall. This tumor is extremely sensitive, and the whole foot is hot and
painful. After a few days a small spot in the skin, over the most
elevated part of the tumor, softens and opens or the hoof separates from
the coronary band at the quarter or well back toward the heel. From this
opening, wherever it may be, a thin, watery, often dark, offensive
discharge escapes, at times mixed with blood and always containing a
considerable percentage of pus.

Probing will now disclose a fistulous tract leading to the bottom of the
diseased tissues. If the opening is small, there is a tendency upon the
part of the suppurative process to spread downward; the pus gradually
separates the hoof from the sensitive laminae until the sole is reached,
and even a portion of this may be undermined.

As a rule, the slough in this form of quittor is not deep, and if the
case receives early and proper treatment complications are generally
avoided; but if the case is neglected, and, occasionally, even in spite
of the best treatment, the disease spreads until the tendon in front,
the lateral cartilage, or the coffin bone and joint as well are
involved.

In all cases of subhorny quittor much relief is experienced when the
slough comes away, and rapid recovery is made. If, however, after the
lapse of a few days, the lameness remains and the wound continues to
discharge a thin, unhealthy matter, the probabilities are that the
disease is spreading, and pus collecting in the deeper parts of the
foot. In Zundel's opinion, if the use of the probe now detects a pus