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Pet Owner Version

The Immune System of Dogs

By

Ian Tizard

, BVMS, PhD, DACVM, Department of Veterinary Pathobiology, College of Veterinary Medicine and Biomedical Sciences, Texas A&M University

Last full review/revision Jun 2018 | Content last modified Sep 2022

The immune system consists of a network of white blood cells, antibodies, and other substances that fight off infections and reject foreign proteins ( see Table: Specialized Cells and Molecules of the Immune System Specialized Cells and Molecules of the Immune System Specialized Cells and Molecules of the Immune System ). In addition, the immune system includes several organs. Some, such as the thymus gland and the bone marrow, are the sites where white blood cells are produced. Others, including the spleen and lymph nodes, trap microorganisms and foreign substances and provide a place for immune system cells to collect, interact with each other and with foreign substances, and generate an immune response.

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