World Animal Day was started in 1931 at a convention of ecologists in Florence as a way of highlighting the plight of endangered species. Since then it has grown to encompass all kinds of animal life and is widely celebrated in countries throughout the world. October 4 was chosen as World Animal Day as it is the Feast Day of St Francis of Assisi, the patron saint of animals.

It is intended as a day of celebration for anyone in the world who cares about animals. It is not restricted to any one nationality, creed, religion, political belief or ideology.