46 ■ DISEASES OF SWINE 



of the lungs. This may occur when they are chased 

 by dogs and boys, or when driven to a distant 

 market at too rapid a pace. Exercise during the 

 hot summer months is apt to cause congestion of 

 the lung tissue as well as heat-stroke. Washing 

 or diping hogs during the cold weather may chill 

 the body and result in disease. 



Symptoms. — Pneumonia following as a result of 

 a bad cold is preceded by the symptoms of the 

 primary disease. If due to severe exercise, the 

 animal appears greatly exhausted and the conges- 

 tion of the lungs is marked. Death may occur in 

 this stage of the disease. 



Inflammation of the lungs usually begins with a 

 chill, and is followed by a high fever. The hog lies 

 down most of the time, hiding under the litter, and 

 may eat nothing or but very little. The respira- 

 tions are hurried at first, but when the lungs be- 

 come badly involved they are also labored. The 

 character of the pulse-beats vary, depending on the 

 extent of the inflammation and the stage of the 

 disease. In most cases it is full and quick during 

 the early stages, but later, as the condition of the 

 animal improves, more nearly normal. A very 

 weak pulse is present in severe and fatal pneu- 

 monias. 



The visible mucous membranes have a red, con- 

 gested appearance, and there may be a slight dis- 

 charge from the nostrils. The expression of the 

 face is anxious and distressed in severe cases, and 

 rigors and chilling of the body occur. 



