Kate meets a team of researchers at the University of Aberystwyth, whose groundbreaking DNA survey into Welsh sheepdogs brings to light some remarkable facts about this unique breed. Meanwhile, Teg is packed off to a remote Welsh farm for some quality time with her chosen mate. If Teg can produce a litter of healthy Welsh sheepdog puppies, she can play a big part in helping this ancient and once-endangered breed survive for generations to come.