When Kate Humble decides she wants to breed from her dog Teg, she finds out that her beloved pet is a Welsh sheepdog. She sets out to learn more about this little-known and endangered breed, and discovers that a true Welsh sheepdog is a working dog. Kate wants Teg and her future puppies to be certifiably Welsh, and sets out to train Teg to work in the traditional Welsh way. Teg shows willing, and Kate works on her own shepherding skills, but will the demanding experts from the Welsh Sheepdog Society be impressed by the pair's performance?