THE HORSE—THE EXTREMITIES, 173 
CANKER IN THE FEET. 
Canker ir. tne feet often results from neglected thrush, the inflamma- 
tion extending from the horny frog to the horny sole, when a fungus- 
secretion forms, The coffin bone may be affected. Its causes are the same 
as in thrush—long-continued moisture, especially with decomposition and 
heat. In some cases it may be constitutional, or it may follow grease. 
Symptoms.—Where horn is removed from the sole, fungous growths 
appear, covered with a whitish, offensive matter. In other parts the horn 
is discolored, with a dark-colored fluid underneath. When the disease has 
run some time, the whole frog and sole may be ulcerated. 
TREATMENT.—Freely expose the diseased parts by removing all dead 
or detached pieces of horn. Put ona shoe with a plate to cover the frog, 
attaching this plate to the toe by a hinge, and to the heel by a bar or two. 
screws; this shoe furnishes pressure to the frog, which zs all-important, 
and makes dressing possible without removing the shoe. A substitute is 
gutta-purcha heated in boiling water and slipped under the shoe. This can 
be taken out and put in without removal of the shoe. In most cases the 
morbid growth will be stopped and healthy horn grow by giving Fowler’s. 
Solution of arsenic three times a day internally, with an external use of 
carbolic acid applied with pressure. The most certain remedy is a caustic 
(nitric acid, sulphate of copper, carbolic acid or tar) applied under the 
shoes made as above described, putting tow under the iron or gutta-percha 
sole to secure pressure. The caustic-dressing may be repeated every two 
or three days until the horn becomes healthy. When only a thin, watery 
discharge is seen, chloride of zinc, two grains to one ounce of water, or 
calomel in powder, applied daily, will usually suffice. 
CORNS. 
A corn is a very sensitive, fungus-like growth of horny matter and 
granulations of a reddish color between the horny sole and sensitive part 
of the foot, generally at the inside of the sole of the fore feet. In some 
cases a pus-like matter forms under the sole, or breaks out at the crown as 
in quittor. It is caused by contraction of the hoof or pressure from bad 
shoeing. 
Symptoms.—The angle between the bars and crust is of a dark-red. 
color, soft, fungus-like, painful, and perhaps attended with lameness. 
TREATMENT.—For much inflammation and formation of pus, remove 
the bars and other means of pressure, and apply at least twice a day arnica- 
lotion, one part of the tincture to four of water. In most cases it is suffi- 
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