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"There are several different organisms that cause ehrlichiosis in domestic dogs.  One of the most common is Ehrlichia canis, which is a species of bacteria that is transmitted to dogs through the saliva of brown dog ticks. Brown dog ticks are found in most tropical and subtropical areas world-wide. They are fairly common throughout the United States. Some species of Anaplasma bacteria also cause ehrlichiosis in dogs.  These organisms are carried by hard-shelled Ixodes ticks, which are found mainly in California and in the Northeastern and upper Midwestern states.  They are primarily a parasite of platelets, which are the cells in blood that are primarily responsible for its ability to clot.  Finally, some Neorickettsia bacteria can cause ehrlichiosis in dogs. They also can cause Potomac Fever in horses and salmon poisoning disease in dogs, which are completely different disorders."^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.petwave.com/Dogs/Health/Ehrlichiosis/Causes.aspx>