It seems to be possible to bug this quest by arriving at “Cymbel’s Rescue” in Fields of Ruin before Nia, which causes Nia to run back to the ogre pen with the already retrieved hounds to retrieve the hounds all over Again. This does not cause a doubling of hounds, but it loops the quest until you let Nia run into the “Rescue” before you. When you run into the rescue before her she just stops at the entrance, says her dialogue and runs back with the hounds. Not a game breaking bug by any means, but something worth noting.