This text covers viral, bacterial, fungal and parasitic infections in the dog and cat. The bulk of the book concentrates on two aspects: commonly encountered diseases, and diseases which are specifically infectious. However, the lesser infections are mentioned briefly (key clinical signs, diagnosis, reference to further information), especially where they might affect the diagnosis of another disease. For each infectious agent a series of topics are introduced: the agent, pathogenesis, pathology, clinical signs, diagnosis, treatment, epidemiology, vaccination and control. In addition, there are tables of differential diagnosis and vaccination.