Dogs are freakin amazing when it comes to smell check these out

http://www.scienceagogo.com/news/20060005201345data_trunc_sys.shtml

http://www.thepeninsulaqatar.com/Display_news.asp?section=World_News&subsection =Rest+of+the+World&month=November2007&file =World_News200711028146.xml

http://www.familymatters.tv/level_4/pets/moldsniffingdogs.htm

dogs seem to do it all