During the early 1990s, the ability of dangerous diseases to pass between animals and humans was brought once more to the public consciousness. These concerns continue to raise questions about how livestock diseases have been managed over time and in different social, economic, and political circumstances. Healing the Herds: Disease, Livestock Economies, and the Globalization of Veterinary Medicine brings together case studies from the Americas, western Europe, and the European and Japanese colonies to illustrate how the rapid growth of the international trade in animals through the nineteenth century engendered the spread of infectious diseases, sometimes with devastating consequences for indigenous pastoral societies. At different times and across much of the globe, livestock epidemics have challenged social order and provoked state interventions, often opposed by farmers and herders. The intensification of agriculture has transformed environments, with consequences for animal and human health.