Who would win cow vs sheep vs mouse vs dog?

Well if the dog was a grown up, it would win. So a dog would win. One, because it would eat the mouse, two, would kill or chase the sheep away, and two, nip at the cow's heels and drive the cow off.

But, the cow could win over the dog because she can easily kick or butt the dog enough to injure it and send it packing with its tail between its legs.