90 CANINE DISTEMPER 
engorgement; they gradually diminish as the lung 
becomes hepatised, but their renewal at a later date 
will signify that recovery is taking place. 
(6) Pleurisy.—Pleurisy in my experience occurs but 
rarely in cases of distemper, and then is always a serious 
complication. In the acute type the pleura first becomes 
reddened, and a soft grey lymph exudes. This is the 
dry stage, signified by impaired chest movement, sounds 
of friction on auscultation, and pain in the sides of the 
chest. The disease may stop here, or may progress to 
the second stage, in which a copious exudation of serum 
occurs (stage of liquid effusion), bringing in its wake 
increased dyspnoea, but a diminution of pain. There is 
now dullness on percussion over the fluid, the area of 
dullness changing with changes of position; the inter- 
costal depressions tend to become effaced owing to the 
internal pressure of the thoracic liquid. 
No sounds appear to come through the liquid, but 
above its level an increased resonance and friction 
sounds may be heard. Frequently during the second 
stage the dog succumbs from exhaustion. I recently 
treated a Yorkshire terrier puppy which showed no 
other symptoms during the first eight days than those 
of pleurisy, and I considered I was dealing solely with 
that disease, until, on the ninth day, three of the charac- 
teristic symptoms of distemper set in. 
(7) Gangrene of the Lungs.—On very rare occasions gan- 
grene of the lungs has been known to supervene. It 
can be detected by the very foul odour of the breath 
combined with a putrid-smelling nasal discharge ; when 
present it is always fatal. 
(8) Edema of the Lungs.—This condition is observed 
in very young, very old, or weak, debilitated animals, 
and is a very grave symptom indeed. It follows in the 
wake, not only of distemper, but of any very debilitating 
