You can only milk a cow so long, then you're left holding the pail.

You can only milk a cow so long, then you're left holding the pail.

Milk the cow that standeth still

I don't believe that you have to be a cow to know what milk is.

Keep a cow, and the milk won't have to be watered but once

Opie, you haven't finished your milk. We can't put it back in the cow, you know.