Anal Sacs

**Definition:** A pair of anal glands or sacs, located on either side of the ANUS, that produce and store a dark, foul-smelling fluid in carnivorous animals such as MEPHITIDAE and DOGS. The expelled fluid is used as a defensive repellent (in skunks) or a material to mark territory (in dogs).

**Tree numbers:** - A13.073

**Synonyms:** - Anal Glands, Animal