CAUSE.—Frequently occurs when dogs are accustomed to warm, comfortable quarters, then exposed to cold, drafty kennels during cold weather. In fact, any sudden chilling of the body is a common cause of lung disorders. Giving fat dogs too much exercise when they are not accustomed to it is frequently the cause of engorgement and inflammation of the soft spongy tissue of the lungs. Excessive exercise or running during the hot summer months is apt to cause congestion of the lung tissue as well as heat stroke. Washing or dipping dogs during cold weather may chill the outer surface of the body and result in Congestion of the Lungs. SYMPTOMS.—Lung Fever follows as a result of a bad cold, and is preceded by the symptoms of the primary disease. If due to severe exercise, the animal appears greatly exhausted, and the congestion of the lung substance is marked and may occur at this stage of the disease. Lung Fever usually begins with a chill, and is followed by a high fever. The dog lies down most of the time, and eats nothing, or very little. The breathing is hurried and fast, but when the lung becomes badly involved it is labored. The character of the pulse beat varies, depending on the extent of the inflammation and the stage of the disease. In most cases the pulse beats are full and quick during the first stage, but later, as the condition of the dog improves, more nearly normal. A very weak pulse is present in severe and fatal lung inflammation. The visible mucous membranes of the eyes and mouth have a congested appearance, and there may be a slight discharge from the nostrils, reddish in color. The expression of the face is distressed and anxious, and in severe cases, rigors and chilling of the body occur. The respiratory sounds become more or less changed from normal. The cough is at first deep and dry, later loose and moist. It may be accompanied by a hemorrhage of the lungs during the first stages of the disease. Other respiratory sounds are revealed by placing the ear to the side of the chest wall and listening. In the very early stages of lung fever, a crepitating, or crackling sound can be heard in the diseased parts; and louder sounds than normal in the healthy areas. Later, when the engorgement of the lung substance occurs, and the air cells become filled by the inflammatory exudation, the respiratory sounds are deadened. On returning to the normal, rattling sounds occur. These signs aid greatly in determining the dog’s condition. The chance for recovery depends on the extent and acuteness of the disease. Careless handling, exercise, etc., lessens the chance for a favorable termination in this disease, and good nursing helps more in bringing about a recovery than the medical treatment. The chances are more unfavorable in fat dogs than in lean ones, as the inflammation is usually more severe in the former. The course of the disease is from one to three weeks, and it may become chronic if the irritation is kept up.