100 The Diseases of Animals 
PUNCTURED WOUNDS OF THE FOOT 
These are wounds made by some sharp object punc- 
turing the sole or the frog and injuring the soft tissues. 
They are likely to be serious, as the coffin-joint is often 
punctured, and tetanus (lockjaw) follows in other cases. 
Generally the injury arises from “picking up a nail” or 
from the prick of a nail in shoeing. In all cases of 
sudden and decided lameness, the foot should be carefully 
examined for nails and similar objects, or for holes 
which they have made. 
The nail or foreign body should first be withdrawn. 
If there is a collection of blood or pus, the hole must be 
enlarged, so that there is free drainage, and the sore 
washed out with a good antiseptic. One part of perox- 
ide of hydrogen to three of water is excellent; so is 
a five per cent solution of carbolic acid in water, pure 
turpentine, or a 1-to-1000 solution of corrosive sub- 
limate. If there is much soreness, the foot should be 
poulticed for a day or two and then treated as a corn 
is that has been opened. The horse should be kept in 
a clean, dry stall, so that no dirt will get into the 
wound. 
THRUSH 
Thrush is a deep fissure in the horny frog extend- 
ing to the sensitive frog and is associated with some 
inflammation of the latter and the discharge of a small 
amount of bad-smelling pus from the cleft of the frog. 
It oceurs in either the front or the hind feet, most fre- 
quently in the latter, It is caused in most cases by 
