Book excerpt: Animal health emergencies are evolving, but they remain among the most challenging situations a country can confront. Infectious diseases and other threats have increasing potential to spread rapidly within a country or around the world due to growing populations, concentration of animal populations and market intensification, human and animal movement, and global trade. This international GEMP Essentials guide is meant to support the advancement of key components of emergency management as countries continue efforts to work and prepare together. It sets out in a systematic way the elements required to achieve an appropriate level of preparedness and proposes an approach to animal health emergency management inclusive of all type of events, be they caused by natural phenomenon, including not infectious events, or by accidental or deliberate human action. The guide also includes the One Health approach.