Cu Sith

The Cù-Sìth is a faerie hound, said to be the size of a young bull. Its fur is shaggy, and usually dark green, though rarely it has appeared with white fur. Its tail is long and either coiled or plaited. Its paws are the width of a man's hand.

The Cu-Sith is the guard dog of the faerie mounds. When the wild magic created white hounds, they altered depending upon who touched them. The Cu Sith thus created bounded off immediately to the Seelie mound where it was said to stand between Taranis and those he abused. Taranis was said to be afraid of the Seelie Cu Sith, as the hounds were the heart of any sithen they guarded - it was a way of saying the sithen didn't like the king very much.

When new faerie land was created in the west, one of Doyle's black hounds turned into a Cu Sith and it then proceeded to awaken those who had fallen after the creation of new faerie land.

The only other Cu Sith to appear came to Meredith's children. One of the black dogs, as yet unaltered, pushed its nose against Bryluen's crib, in its eyes sparks of red and green. When its nose touched her face, the black fur turned green, its head became bigger than the baby. It was recognized as a Cu Sith.