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Canine babesiosis results from infection of 1 of 5 identified protozoal species in the United States (Babesia conradae, Babesia sp. "coco," Babesia gibsoni, Babesia vogeli, and Babesia vulpes). They are part of the Apicomplexa family of protozoa and are obligate intraerythrocytic parasites. Domestic and wild canids are suspected of being intermediate hosts. This updated article aims to provide practical guidance about the clinical manifestations of disease, treatment options, and outcomes. In addition, the authors hope to provide some clarity about the taxonomy and nomenclature of these organisms, as they have undergone multiple changes since their initial discovery.

Bacterial pneumonia is a common clinical diagnosis in dogs but seems to occur less often in cats. Underlying causes include viral infection, aspiration injury, foreign body inhalation, and defects in clearance of respiratory secretions. Identification of the specific organisms involved in disease, appropriate use of antibiotics and adjunct therapy, and control of risk factors for pneumonia improve management.