Fáil Inis was a hound-whelp owned by Lugh Lámhfhada of the Tuatha Dé Danann in the Mythological Cycle of Irish literature. The hound was invincible in battle, caught every wild beast it encountered, and could magically change any running water it bathed in into wine. It was one of the prizes exacted from the children of Tuireann (Brían, Iuchar and Iucharba) as reparation for the slaying of Lugh's father Cian.
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By the same name, or nearly so (Failinis or Ṡalinnis), this hound of Lugh also occurs in recensions of a certain medieval ballad from the Fenian cycle. The ballad relates how the wonder-dog is brought to Ireland by a threesome (also from "Iruaid"). A variant telling of this threesome also occurs in The Colloquy of the Elders, though the dog's name there is Fer Mac.
Before the sons of Tuireann obtained Fáil Inis, the pup belonged to the king of Ioruaidhe (or Iruaid, Irúaith, etc.) (≒ Legendary Scandinavian kingdom), and about this hound it was said that "all the wild beasts of the world […] would fall down out of their standing" (i.e., prostrate themselves) and that it was "more splendid than the sun in his fiery wheels." The hound's hide or pelt moreover possessed the ability to turn water into wine.
The threesome from Ioruaidh encountered by the Fianna also possessed the same dog, Failinis, formerly owned by Lugh. These three used Failinis as a boundless source of wine as well as guard dog. The hound slew one of the Fianna, and as reparation, it was exterminated and flayed for its hide/pelt.
The dog belonging presumably to same trio from Ioruaidh also makes appearance Colloquy of the Elders, but there, the dog is called Fermac (or Fer Mac).
Aided Chloinne Tuireann
The hound's name Failinis appears in the full narrative version of The Fate of the Children of Tuireann (see Brian, Tuireann), which only survives in manuscripts from early 18th century and later. However, neither dog nor its name is by any means a concoction of late tradition. The Lebor Gabála Éirenn (Book of Invasions) gives a brief account of Lugh's demands, according to which he obtained "the whelp of the royal smith of Ioruath" (Irish: Cuilen rīg goband na Hiruaidhe) which was "a hound by night and a sheep by day" and whatever pool of water touched its hide (Irish: croccenn) turned to wine. The hound's name is not specifically given in the Book of Invasions.
12th-century ballad
However, the name of Lugh's dog Failinis is indeed recorded in Medieval manuscripts. It occurs in a certain "ballad" (Irish: dúan) starting with the line "They came a band of three…" (Irish: "Dám Thrír Táncatair Ille). It has been characterised by Stern as an Ossianic ballad of the 12th century, i.e., a poem in the pretext of a work by Oisín in reminiscence of the Fianna's past. The ballad relates how a threesome from Iruaid brings along a magical dog (Irish: Ṡalinnis (Shalinnis) (LL version) / Failinis (Lismore version))) which turns any fresh water (spring water) it touches into mead or wine. The dog once belonged to Lugh of the mantles (Irish: Lugh na Lenn, a corruption of Lugh's matronymic "Lugh mac Ethlenn"). The hound is responsible for the death of one of the Fianna (Dubán mac Bresail) so that the threesome (Sela, Dorait, Domnán) forfeit the dog as compensation. The Fianna then kill the hound and flay its hide (presumably with its wine-making powers intact), and carry it off into foreign campaigns.
Colloquy of the Elders
The Acallam na Senórach (The Colloquy of the Elders), which is narrated by Caílte, also describes a threesome from Iruaid (Ioruaidh, Irúaith) met by the Fianna, and though they have different names (Dub, Ág, Ilar) they must represent the same characters. Their wonder-dog, called here Fermac (or Fer Mac), is not specifically said to have been Lugh's in the past. But it manifests qualities that are similar to it. Here, Fermac was a parti-coloured furred dog, which belched out wine as well as gold and silver. Though it was a huge dog by day, it shrunk to the size of a lapdog by night. Two watchmen (Ulster princes attached to the Fianna), in breach of the threesome's specific warning, spied on them at nighttime, but suffered the consequences. The lapdog swirled a druidic wind with its tail, and the watchmen were swept away, their swords driven into each other's bodies.