1. Where do cows keep their important papers?
    In a beef-case
  2. Where do cows go on first dates?
    The moo-vies
  3. Where did the first cow in space land?
    On the moon
  4. What do you call a lazy cow?
    A bulldozer
  5. Why did the cow cross the road?
    To get to the udder side
  6. Where do cows eat lunch?
  7. What do you call a cow that just gave birth?
    Suggested by @fisackerly
  8. Why do cows wear bells?
    Because their horns don't work.
    Suggested by @tashalipsky