Not to be picky, but "How now" is an old English saying that means, "How is it going?" So they are actually asking after the brown cow's well-being.

Is the brown cow in the room with us now, Jerry?

What's on your mind brown cow

How now, brown cow?

Hairy Nary, Jerry

Brown cows say hi!

Sup, Brown COOOWWWWW!!

How now, brown cow?

Don't buy into the dominant narrative. That cow is ill-informed at best.

Brown chicken brown cow

Just demands for chocolate milk and angry recriminations when they produce the regular sort.

Steady on now, brown cow.