Off subject a bit but I see a white cock blackbird now and again, the first time it had a few black wing and tail feathers but is nearly all white now.
All pros for me if 1 of mine was lost or stolen I'd want it back no matter what, got my young 1 done with her jabs and a bit ago a lass told me dogs trust (think it was them) were doing a scheme so got the old 2 done for free.