How to milk the damn cow...?

[Amythia Darling]

I'm at the quest where you are supposed to get the shipment ready and I need to milk a cow.

I've tried clicking all the cows I can find on the farm.
I've tried kneeling down and then click them.

Am I missing something obvious?

[Arctic Sounds]

You just have to click every cow you can find. I believe kneeling down doesn't do anything to effect the outcome.
Eventually you should find one that will work.

[Bladeglory]

Make sure you're standing near the cow, too surprised