The Hounds of Anwyn (Cwn Annwn), Op 218

From Wikipedia: In Welsh mythology and folklore, Cwn Annwn, "Hounds of Annwn") were the spectral hounds of Annwn, the otherworld of Welsh myth. They were associated with a form of the Wild Hunt, presided over by Gwyn ap Nudd (rather than Arawn, king of Annwn in the First Branch of the Mabinogi). Christians came to dub these mythical creatures as "The Hounds of Hell" or "Dogs of Hell" and theorized they were therefore owned by Satan. However, the Annwn of medieval Welsh tradition is an otherworldly paradise and not a hell or abode of dead souls.
In Wales, they were associated with migrating geese, supposedly because their honking in the night is reminiscent of barking dogs. They are supposed to hunt on specific nights (the eves of St. John, St. Martin, Saint Michael the Archangel, All Saints, Christmas, New Year, Saint Agnes, Saint David, and Good Friday), or just in the autumn and winter. Some say Arawn only hunts from Christmas to Twelfth Night. The Cwn Annwn also came to be regarded as the escorts of souls on their journey to the Other-world.