530 DISEASES OF THE HORSE. 
is dry, the horse stands back in its stall at the end of the halter strap 
with its neck extended and its legs propped apart to favor breathing. 
This condition may end by resolution, leaving the horse for some 
time with a severe cough, or the animal may die from choking up of 
the lungs (asphyxia). 
The swelling under the jaw may be excessive, and if the abscess is 
not opened it burrows toward the throat or to the side and causes 
inflammation of the parotid glands and breaks in annoying fistulas at 
the sides of the throat and even up as high as the ears. Roaring may 
occur either during a moderately severe attack from inflammation of 
the throat (larynx), or at a later period as the result of continued 
lung trouble. Abscesses may develop in other parts of the body, in 
the poll, in the withers, or in the spaces of loose tissue under the arms, 
in the fold of the thigh, and, in entire horses, in the testicles. 
During the course of the disease, or later, when the animal seems to 
be on the road to perfect recovery, abscesses may form in the internal 
organs and produce symptoms characteristic of disease of those parts. 
Roaring, plunging, wandering in a circle, or standing with the head 
wedged in a corner of the stall indicate the collection of matter in the 
brain. Sudden and severe lung symptoms, without previous dis- 
charge, point to an abscess between the lungs, in the mediastinum; 
colic, which is often continuous for days, is the result of the forma- 
tion of an abscess in some part of the abdominal cavity, usually in 
the mesentery. 
Pathology.—The lesions of strangles are found on the surface of 
the mucous membranes, essentially of the respiratory system, and in 
the loose connective tissue fibers of the internal organs and glands, 
and consist of acute inflammatory changes, tending to the formation 
of matter. The blood is unaltered, though it is rich in fibrin, and if 
the animal has died of asphyxia it is found dark colored and uncoagu- 
lated when the body is first opened. If the animal has died while 
suffering, from high fever the ordinary alterations throughout the 
body, which are produced by any fever not attended by alteration of 
blood, are found. 
Prevention.—Healthy horses should be separated from the infected 
animals, and the stables in which the disease has occurred should be 
thoroughly disinfected. Since the disease frequently occurs annually 
on infected premises, systematic disinfection should be practiced after 
an outbreak. The stables, as well as all utensils which might have 
come in contact with the infection, should be thoroughly disinfected. 
By such practices recurrences of the disease may be prevented. 
Treatment.—Ordinary light cases require but little treatment be- 
yond diet, warm washes, moistened hay, warm coverings, and pro- 
tection from exposure to cold. The latter is urgently called for, as 
lung complications, severe bronchitis, and laryngitis are often the 
