I have never heard of this before,, what is it??
Ehrlichiosis is a disease caused by a class of organisms called rickettsi. They are sort of in between viruses and bacteria in the evolutionary scale. The vector for the disease is appropriately enough the brown dog tick. Another rickettsi disease transmitted by ticks is Rocky Mtn Spotted tick fever. Doxycycline is effective against most rickettsi disease.

Diagnosis of tick borne disease requires specific blood antibody tests.