A clinical and epidemiologic picture of canine hepatozoonosis is presented. Clinically the disease is characterized by a chronic debilitating course, persistent or recurrent fever unresponsive to antibiotics and the common babesiocidal agents, progressive anaemia, eosinophilia and polychromasia, and H. canis parasitaemia. H. canis was the most prevalent haematozoan parasite, affecting 22 per cent of the dogs examined; B. canis affected 11 per cent, and E. canis 5 per cent. H. canis affected all ages of dogs while B. canis and E. canis affected predominantly young dogs.

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