Animal vaccination or veterinary vaccination is the process of immunization of a domestic, livestock or wild animal. This practice is associated to veterinary medicines. The first ever veterinary vaccine invented was for chicken cholera in 1879 by the scientist Louis Pasteur. Both the production of vaccines for animals and humans has always been connected, this relationship has been coined 'One Health', as at least 61% of all human pathogens are created from animals. Two major examples of these connections are the rabies and smallpox vaccines.
Veterinary vaccines had and continued to have, a main role in defending animals health and public health, decreasing animal suffering, enabling efficient productions of food animals to feed the growing human population, also greatly reducing the requirement for antibiotic to treat food and companion animals.