SYMPTOMS — 91 
disease which weakens the left side of the heart and 
renders it unable to force the venous blood through the 
lungs. 
Upon its development breathing becomes extremely 
difficult and stertorous, and an opaque blood-stained 
fluid escapes from the nostrils, particularly just before 
and after death. Auscultation reveals loud rattling 
murmurs throughout the lung, and the pulse is irregular. 
Proportionate Frequency of Various Lung Lesions.—It 
is reasonably safe to assert that the majority of dogs 
suffering from distemper do not as a rule contract lobar 
pneumonia, pleurisy, cedema or gangrene of the lungs, 
According to Ferry and his co-workers, records taken of 
sixty-eight cases revealed the lung lesions in the follow- 
ing proportions : 
Broncho-pneumonia «+» 45 (mostly only slightly affected). 
Croupous pneumonia sree AS, 
(Edema ... aide wie 0 
No lung lesions... ne 9 
A goodly proportion of patients, however, never appear 
to suffer from anything worse than laryngitis or bron- 
chitis, especially as judged by their high spirits and 
steady appetites during these mild attacks, and in 
this connection I might aptly quote M‘Gowan, who 
declares: ‘‘What has chiefly surprised me in cases of 
congestion of the lungs, pneumonia, and empyemata, is 
the extent of the morbid changes in the lung when 
contrasted with the slight symptoms they produce in 
the animal during life. I have frequently seen a fat, 
well-nourished puppy running about, playing actively, 
and taking its food well; but on performing a post- 
mortem a day or.two later, have found the lungs prac- 
tically solid with a purulent pneumonia, which must 
have lasted some time. I have seen nine cases of such 
pneumonia and two cases of empyema in the dog due to 
