Sheep

Sheep were quadruped mammals found on Earth and domesticated by humans. They were raised mainly for food and wool.

In 2050, K9 briefly saw a sheep in the dream he shared with Alistair Gryffen. (K9TV: Dream-Eaters)

Sheep went extinct around 2106 after the Ozone Purge, though some records of their existence survived. (NA: Lucifer Rising)

The colonists to Metebelis III brought sheep on their trip, which were able to survive the crash. They later became the food source for both the colonists and Eight Legs, though the Eight Legs preferred human meat. (DW: Planet of the Spiders)

In the far future on Kirith, the Panjistri kept sheep on Kandasi Island as their main source of food. (NA: Timewyrm: Apocalypse)