What is the term for an outbreak of disease affecting animals?

The term "epizootic" specifically refers to an outbreak of disease that affects a population of animals. This term is analogous to "epidemic," which is used for human populations, and indicates a sudden increase in the incidence of a disease that is greater than what is normally expected in that demographic. In the context of animal diseases, an epizootic can significantly impact wildlife or domesticated animal populations and can pose a risk to public health and agriculture.

The other terms listed have different meanings. A pandemic refers to a disease that spreads across a large region, usually multiple countries or continents, and is associated mainly with human populations. Endemic describes a disease or condition that is regularly found and consistently present within a particular geographic area or among a specific group of people or animals. An "outbreak" is a general term that could refer to any instance of disease occurring in a particular population, but it does not specifically denote the animal context like "epizootic."