Dourine of Horses. 
5 
In the stallion there is first an irritation and swelling about the 
penis. The swelling extends throughout the organ, which may be 
continually protruded, with frequent erections. The swelling may 
also involve the groin, with an enlargement of the lymph glands in 
that region, and then extend forward along the abdomen. In a 
few days the penis shows small blisters, which break, discharging a 
yellowish fluid and leaving irregular, raw ulcers, which, if situated 
near one another, have a tendency to run together, resulting in a 
Fig. 1. — Stallion in good condition at time of purchase. (Dourine afterwards developed.) 
large raw surface with an irregular border. The ulcers show a 
tendency to heal rapidly, leaving white scars, which are permanent. 
In some cases the urinary opening is very red and swollen, and a 
yellowish fluid may drip from it. The stallion retains his breeding 
instinct and becomes very amorous when brought in the vicinity of 
mares. If allowed access to mares in season, service is often impos- 
sible, owing to the fact that a complete erection of the penis does not 
occur. The testicles may be involved and become tender to pres- 
sure, and abscess formation and sloughing may occur. In certain 
cases the initial symptoms may be so slight as to pass unnoticed, which 
is especially true of animals running on the open range and not seen 
by the owner for long periods. 
In mares the disease, being the result of copulation, begins with 
swelling and inflammation of the genitals, exposing the clitoris, which 
183742°— 20 2 
