Cù-sìth

Cu sithCù SìthCu Sìthfairy hound
The cù-sìth(e), plural coin-sìth(e) is a mythological hound found in the folklore of Scotland.wikipedia
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Death (personification)

Grim ReaperDeathAngel of Death
The cù-sìth was feared as a harbinger of death and would appear to bear away the soul of a person to the afterlife, similar to the manner of the Grim Reaper.
In Scottish folklore there was a belief that a black, dark green or white dog known as a Cù Sìth took dying souls to the afterlife.

Aos Sí

SidhesídheDaoine Sidhe
Other varieties of aos sí and daoine sìth include the Scottish bean nighe: the washerwoman who is seen washing the bloody clothing or armour of the person who is doomed to die; the leanan sídhe: the "fairy lover"; the cat sìth: a fairy cat; and the Cù Sìth: fairy dog.

Cŵn Annwn

Cwn Annwnpack of houndsArawn's dogs
A similar creature exists in Irish folklore (spelled cú sídhe), and it also bears some resemblance to the Welsh Cŵn Annwn.

Banshee

bansheesBanshee GhostBean Sidhe
In this role the Cù-Sìth holds in Scottish folklore a function similar to that of the Bean Sidhe, or banshee, in Irish folklore.

Beast of Buchan

In Scotland the hounds are known as Cù Sìth, although the colour is generally a dark shade of green or occasionally white.

Hebridean mythology and folklore

Hebridean Myths and Legendsmyths and legends
It is alleged that this is a fairy hound.