When Tick Disease Attacks the Brain: CNS Vasculitis from Ehrlichia canis in a Dog

We all know ehrlichiosis as a tick-borne disease that typically presents with fever, thrombocytopenia, and maybe some nonspecific lethargy. But a fascinating case report published in Veterinary Medicine and Science reminds us that Ehrlichia canis can do something far more dramatic: trigger severe central nervous system vasculitis that mimics other serious neurological conditions.