Tick Fever is caused by a type of bacteria called Ehrlichia. This bacteria is spread by different types of ticks and is found in the Maricopa County area. Dogs with tick fever can be listless, have a change in appetite and may have enlarged lymph nodes. There may be a fever or abnormal bleeding as well, but some dogs do not show any signs or symptoms at all. Diagnosis is made through a simple blood test and tick fever is typically treated with antibiotics.