Both parents have bi-eyes. But you can tell with this breed when the eyes open. I know the eyes are light colored at opening, but the ‘blue’ eyes are lighter even. There was a almost 3 week old bi-eye baby there when I was there last week(a boy black tricolor, so cute!) and it was apparent which eye was which. The blue eye was almost white, whereas the other eye was kinda grey-ish blue but definitely darker! The breeder was telling me, the ones with blue eyes thats she’s had tended to open their eyes a few days later than the all brown eyed babies.