This document discusses the benefits of mass vaccination programs for animal diseases that can infect humans (zoonoses). It first presents data showing that mass vaccinating 25 million livestock animals in Mongolia against brucellosis would provide over $30 million in total societal benefits, including public health benefits, private health benefits, reduced household income loss, and agricultural benefits. It then uses a mathematical model to show that mass dog vaccination is less costly than human post-exposure prophylaxis for controlling rabies transmission between dogs and humans. Finally, it references a study that found an approach combining dog and human vaccination for rabies control in N'Djaména to be more cost-effective than human