Animal disease is a term that refers to any ailment that affects the health of animals. There are several ways to describe this term using different words that have the same meaning. One popular synonym is "zoological disease." This phrase speaks to the study of animals and their diseases as they relate to their natural environment. "Livestock disease" is another common term used to describe animal ailments that affect farm animals such as cows, pigs, and sheep. "Veterinary disease" is also a suitable alternative for animal disease as it specifically refers to diseases that afflict domesticated animals and pets. Additionally, "zoonotic disease" is a term used to refer to animal diseases that are transmissible to humans.