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 records of their existence survived. (NA: Lucifer Rising)

The colonists to Metebelis III brought sheep on their trip. They survived the crash. They later became a food source for 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)