I know kinda mundane after the other wildlife we have looked at. Yes, there are wild cattle but they live in countries far, far away. In North America the cow is the single most important animal that we have domesticated. We eat or use every part of it. On top of that the terms cow, cows, and COW are used in numerous other industries to refer to things. (I didn't know that until just now).
Just like many others, cows can be spirit animals.
Sweet right? When I first accepted the cow as one of my spirit animals I had no idea why after finding this it made sense.