I can't say I hate cats, but holy cow, dogs are a horse of another color.

That, of course, is the question. Why buy the cow when you can have the milk? Or the house when you can just rent?

Why buy a cow if you can get the milk for free

Milk the cow that standeth still

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.