Colour co-ordinated farm animals?

After finishing a pot of tea at Yew Tree Farm at the weekend, I stopped to admire the half-timbered spinning gallery.  In front of the barn, two black and white turkeys looked curiously at me.   Then I saw these by the stream which runs near the barn:

In the lane nearby, I encountered those little black and white pigs -

A short distance away stood some Galloway cattle -

And in a field behind the farm, Herdwick sheep - too far away to see clearly here, but they have dark bodies and white faces and legs -

On the way back, I glanced towards the barn again, to see a black and white Border Collie resting in a doorway.  Is there a pattern here - colour co-ordinated farm stock?  Very smart.