DISEASES AND TREATMENT OF THE HORSE 113 



day in his feed. Gradually bring him back to his natural feed 

 and work again. 



12. Inflammation of the Lungs (Pneumonia). 



This disease is an inflammation of the lung substance 

 itself and is quite commonly met with. The lungs in their 

 natural state will float on water. In the first stage of this 

 disease the lungs are filled with blood and serum, and they 

 are of a dull reddish color; at this stage, if the animal dies, 

 the lungs will still float on water. As the disease develops 

 the lungs change to a dark, grayish appearance ; if the animal 

 dies and the lungs are put in water they will sink. 



Causes. — The causes are much the same as those of con- 

 gestion of the lungs and generally affect horses kept in a 

 poorly ventilated stable, which has a tendency to weaken the 

 lungs. Sudden changes in the weather, such as there are in 

 the fall and spring, are liable to cause this disease. It is also 

 sometimes caused by keeping a horse in a warm stable and 

 then turning him out in pasture to lie on the cold ground; 



Fig. 4. — Position Assumed During an Attack of Pneumonia. 



by becoming wet and chilled during a cold rain storm; by 

 having a horse clipped and exposed to the cold; by standing 

 in a draft while warm ; by inhaling smoke ; or by driving 

 against a cold wind too soon after having influenza, dis- 

 temper, or any of those weakening diseases. It also fre- 

 quently follows congestion of the lungs. 



