Cŵn Annwn

In Welsh mythology and folklore, Cŵn Annwn (Welsh pronunciation: [kuːn ˈanʊn], "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 either Arawn, king of Annwn in the First Branch of the Mabinogi and alluded to in the Fourth, or by Gwyn ap Nudd as the underworld king and king of the fair(y) folk is named in later medieval lore.

In Wales, they were associated with migrating geese, supposedly because their honking in the night is reminiscent of barking dogs.

Hunting grounds for the Cŵn Annwn are said to include the mountain of Cadair Idris, where it is believed "the howling of these huge dogs foretold death to anyone who heard them".

According to Welsh folklore, their growling is loudest when they are at a distance, and as they draw nearer, it grows softer and softer. Their coming is generally seen as a death portent.

Owner

Arawn, king of Ännwn, is believed to set the Cŵn Annwn loose to hunt mundane creatures. When Pwyll saw the Cŵn Annwn take down a stag, he set his own pack of dogs to scare them away. Arawn then came to him and said that as repentance for driving away the Cŵn Annwn, Pwyll would have to defeat Hafgan.