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"Oslerus osleri, also known as Filaroides osleri and more commonly called tracheal or lung worms, are fairly small parasites that infect and irritate the windpipe.  They have been reported in many countries and are found in mink, polecats, monkeys, cats, dogs and a number of Australian marsupials. Tracheal worms spend most of their lives inside their hosts. Puppies can become infected by parasite larvae in the saliva of their infected mother. Dogs also can become infected with tracheal worms by ingesting larvae in infected regurgitated food or feces.  Ultimately, the parasite larvae molt and migrate through the dog&amp;rsquo;s bloodstream, maturing into adults in the dog&amp;rsquo;s upper respiratory tract.  They end up forming lumpy nodules in the trachea (windpipe).  Despite their small size, tracheal worms can cause fairly severe respiratory illness in some dogs, although in others they cause only mild symptoms.  At times, they go undetected."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Lung-Worms.aspx>