<http://schema.org/articleBody>
"Pneumonia is not particularly common in healthy mature dogs.  It is more often a disease of the very young, the very old and those with weak or compromised immune systems.  When it does occur, pneumonia can be acute (come on suddenly) or chronic (come on slowly).  The main functions of the lungs are to supply the blood with oxygen inhaled from outside air, and to dispose of carbon dioxide waste in exhaled air.  When signs of pneumonia are present, they are attributable to insufficient intake of oxygen and inefficient oxygen exchange and delivery to body cells, both of which are caused by inflammation and irritation of airway and lung tissue and by mucus build-up in the respiratory tract."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Pneumonia/Symptoms.aspx>