Minecraft Dungeons:Cow

Cows are passive mobs that can be killed on most levels for occasional item drops.

Spawning
Cows usually spawn within aboveground levels or within the background of certain levels such as the Creepy Crypt. They spawn in the Squid Coast, the Creeper Woods, the Pumpkin Pastures, and the Cacti Canyon.

Behavior
Walk around aimlessly, just like sheep