A 7-year-old Labrador retriever had nonspecific clinical signs that included lethargy, malaise, and difficult ambulation. The dog was native to Vancouver Island, British Columbia, and had never left this area. Morulae were identified in polymorphonuclear cells. Serologic studies and polymerase chain reaction (PCR) testing confirmed canine anaplasmosis caused by Anaplasma phagocytophilum. The dog recovered after treatment with tetracycline.

Canine anaplasmosis caused by Anaplasma phagocytophilum can be treated with tetracycline, and the dog recovered after treatment.

Anaplasma phagocytophilum infection (granulocytic anaplasmosis) in a dog from Vancouver Island.

Key Takeaway: Canine anaplasmosis caused by Anaplasma phagocytophilum can be treated with tetracycline, and the dog recovered after treatment.