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Published on Jan 4, 2026

Ehrlichiosis

Ehrlichiosis in Dogs ("Tick Fever")

Ehrlichiosis is a serious bacterial infection transmitted by the Brown Dog Tick. It is one of the most common tick-borne diseases in warmer climates and among rescue dogs from Southern and Eastern Europe.

1. Transmission and Progression

The bacteria (Ehrlichia canis) infect white blood cells. The disease typically progresses through an acute stage (fever, lethargy), a subclinical stage (no visible symptoms for months or years), and a chronic stage (severe illness).

2. Symptoms

  • Recurrent fever and loss of appetite.

  • Bleeding disorders: Nosebleeds, small red spots on the gums (petechiae), or bruising.

  • Swollen lymph nodes and stiff joints.

  • Weight loss and pale gums.

3. Diagnosis and Treatment

Ehrlichiosis is diagnosed through blood work (antibody tests or PCR). The primary treatment is a 3- to 4-week course of antibiotics, typically Doxycycline. Early intervention usually leads to a full recovery.