Koiyamainu appears in the second part of Kyokutei Bakin’s tale Musobe Kocho Monogatari. It is described as one of the strange beings found in Bonnoukyo, a distant foreign land visited by the story’s protagonist.
The creature is said to resemble a beast with the face of a human — sometimes that of a woman — while its long, loose hair trails down its back like a tail. Its appearance is unsettling, caught somewhere between person and animal.
Koiyamainu wanders while crying out in a mournful voice. Its call sounds like, “I want to see you, I want to see you — owwow, owwow.” The cry echoes through the land, filled with longing and sorrow.
Its name reflects this nature: a play on the idea of lovesickness and that of a diseased or troubled dog. The creature’s lament expresses yearning for someone absent, its voice carrying the pain of desire that cannot be fulfilled.
Ken’etsu appears in the humorous illustrated work Mubō Sanzai Zue. Rather than a fearsome monster, it belongs to the strange and satirical creatures sometimes described in Edo-period folklore and parody bestiaries.
It is said that Ken’etsu was born from mud, and its body bears the color of damp earth — a bluish-black tone like wet soil. Like birds whose feathers resemble leaves or fish whose scales mirror the ripples of water, Ken’etsu’s appearance reflects the place of its origin.
The creature is described as a dog that vomits everything it eats, never needing to defecate. It drinks enormous quantities of water, and as it does so, its complexion shifts and changes. From this image comes an old saying about a dog that “vomits and changes color.”
In some depictions, Ken’etsu is shown in a more humanlike form — a figure crawling on all fours, retching repeatedly, illustrating the comparison between the creature and a drunken person who has made themselves sick. Because of this, the name “Dog’s Delight” also came to be used as a humorous expression for a drunkard who vomits and grows pale, likened to a dog contentedly eating its own sick.
Thus Ken’etsu lives on less as a terrifying spirit and more as a grotesque and comic yokai, a muddy creature of excess, sickness, and satire.
In the folklore of Okinawa, there is said to be a mysterious yokai known as Innu, a name that simply means “dog” in the local language. The creature is remembered mainly through brief written references rather than long stories, but those mentions describe it as something uncanny and supernatural.
According to one early account, the Innu is a strange being that wanders about while dealing with fire. Some traditions say it roams the night devouring flames, moving from place to place as if feeding on burning light. Other interpretations describe it not as eating fire, but as carrying it, walking through the darkness with flames in its presence like a living torch.
Though little detail survives about its appearance or behavior beyond this, the Innu is remembered as a roaming, fire-associated dog spirit, moving silently through the night in the villages of Okinawa, its presence tied to mysterious lights and wandering flames.
Tradition / Region:Japanese Mythology Alternate Names: Monster Born from a Dog; Beaked Dog of Tojinmachi Category:Dog
The Myth
During the Kanpō era in the mid-18th century, a strange event was said to have occurred in Tojinmachi in Fukuoka. A household dog gave birth to a litter in which one of the newborns was unlike the others.
This puppy was described as having the body of a normal dog but a head shaped like the thick, curved beak of a crow. The unnatural appearance shocked those who saw it, and word spread quickly through the town. Such abnormal births were often regarded as signs or warnings, and people treated the creature with a mixture of fear and curiosity.
Despite its unusual form, the puppy was cared for. It was fed rice and fish like any other household animal, but it survived only a short time before dying.
The incident was later recorded in illustrated works such as Kaikaidan Ekotoba. Although the scroll itself did not give the creature a specific name, later sources referred to it simply as “the monster born from a dog.” In modern references, it is often called the Beaked Dog of Tojinmachi, remembered as one of the strange births and ominous wonders noted in Edo-period tales.
Sources
Tyz-Yokai Blog. (n.d.). Beaked Dog. Retrieved March 1, 2026, from https://tyz-yokai.blog.jp/archives/1069207156.html
Tradition / Region: Japanese Mythology Alternate Names: – Category: Dog
The Myth
Yatsufusa was a remarkable dog said to have been born in a village beyond Toyama in Awa Province. When he was only a week old, his mother was killed by a wolf, and the pup seemed certain to die. But a raccoon dog, appearing as a drifting will-o’-the-wisp, came and nursed him with milk. The pup survived and grew into an unusually large, powerful dog with sharp eyes and a noble bearing.
Word of this strange animal reached Satomi Yoshizane, lord of Awa, who summoned the dog to his court. The dog’s black-and-white coat bore eight peony-like markings, and so he was named Yatsufusa, “Eight Tufts.” He became the Satomi family’s cherished pet and grew deeply attached to Yoshizane’s daughter, Princess Fusehime, never leaving her side.
Years later, famine weakened the Satomi lands, and the enemy lord Anzai Kagetsura invaded. The castle stood on the brink of collapse. In desperation, Yoshizane jokingly told the starving Yatsufusa that if he killed the enemy general, he would reward him with Fusehime’s hand in marriage.
That night, Yatsufusa returned carrying the severed head of Kagetsura. The promise, made in jest, had been fulfilled in earnest. Yoshizane rewarded the dog with rich food and servants, but Yatsufusa refused all comforts, remaining beside the head as though waiting for the promised reward.
When Yoshizane realized the dog’s attachment to his daughter, he tried to drive Yatsufusa away. The dog broke loose and forced his way into the mansion, and Yoshizane prepared to kill him. Fusehime stopped her father, reminding him that a promise once spoken must be honored. Reluctantly, Yoshizane allowed her to leave with the dog.
Yatsufusa carried Fusehime into the mountains, where they lived together in a cave. She brought with her a copy of the Lotus Sutra and spent her days reciting it. Yatsufusa listened, growing calm and devoted, and never violated her. A hermit’s messenger later revealed that the dog’s true nature was bound to past grudges and karmic ties, but that the sutra’s power had begun to free him.
Through the merit of the sacred text, Fusehime conceived eight spiritual children. She later resolved that she and the dog should end their suffering and be reborn in better form. As Yatsufusa prepared to follow her into the water, a shot rang out. A warrior attempting to rescue the princess fired, and the bullet struck both dog and girl.
Fusehime died after proving her purity, and the rosary she carried burst apart, sending eight sacred beads flying into the world. From these beads would arise the Eight Dog Warriors, heroes bound by virtue.
After her death, Fusehime’s spirit was sometimes seen riding Yatsufusa, guiding the warriors who carried the beads and watching over their destinies.
Tradition / Region: Japanese Mythology Alternate Names: – Category: Dog
The Myth
Sunekosu is a strange creature said to appear in Oda County of Okayama Prefecture. It is most often encountered on rainy nights, when the roads are quiet and visibility is poor.
Those walking alone sometimes feel something brush suddenly against their legs. Looking down, they may glimpse the shape of a small animal like a dog slipping past them in the darkness. It moves silently and quickly, weaving between the legs of travelers before vanishing into the night.
The creature does not attack, but its sudden contact startles those who encounter it. Afterward, nothing can be seen or heard, leaving only the uneasy feeling that something unseen passed close by in the rain.
Tradition / Region: Romani Mythology, Czech Mythology Alternate Names: “The Tailed,” “The Caudate” Category: Dog
The Myth
Poreskoro is the ninth and final child of Ana, the dread mother of disease in Romani tradition. Ana herself was born from the violent and unhappy union of the Queen of the Keshalyi and the King of the Loçolico, and her offspring were feared as embodiments of sickness and corruption.
After earlier attempts to prevent further monstrous births failed, the Keshalyi tried one last desperate measure. They fed their queen a potion made from cat hair, powdered snake, and hair taken from the hound of hell. From this dark mixture came Poreskoro.
The creature was unlike any of the others. It appeared as a strange birdlike being with four dog heads, four cat heads, and a snake’s tail ending in a forked tongue. It was both male and female, able to produce offspring without a mate.
Those offspring were not living creatures in the ordinary sense. They were the great diseases of the world — plague, cholera, smallpox, and countless other sicknesses that spread across humanity. Poreskoro dwells deep underground with these children, and when it rises to the surface its appearance is taken as a sign that pestilence and destruction will soon follow.
Even the King of the Loçolico was horrified when he saw this child. Realizing the union had brought only ruin, he and Ana separated. Ana withdrew to a remote mountain castle, kept alive by the Keshalyi, who visit her daily and give her drops of blood to sustain her. Sometimes she appears as a golden toad, but more often she is only heard whispering a single command — a word meaning “bring” or “pass.” Those who hear it must obey, tossing some small creature away, or risk being crushed by her unseen power.
Meanwhile, her children remain beneath the earth, and through Poreskoro the world’s diseases continue without end.
Tradition / Region:Greek Mythology Alternate Names: Kerberos Category: Dog
The Myth
Cerberus is the monstrous hound who guards the gates of the underworld, preventing the dead from escaping and the living from entering without permission. He is the offspring of the fearsome beings Typhon and Echidna, and brother to other dreadful creatures such as the Hydra, Orthrus, and the Chimera.
Descriptions of Cerberus vary widely. In the earliest tales he was said to have many heads — fifty, or even a hundred. Later tradition most often gives him three dog heads, though he is also described with serpent tails, snakes writhing from his body, or a mane made of serpents. His eyes were said to flash fire, his hearing was keen, and he fed on raw flesh.
Cerberus’ chief role was to stand watch at the entrance to Hades, terrifying any who approached. Yet he appears in myth most famously during the final labor of Heracles.
King Eurystheus commanded Heracles to descend into the underworld and bring Cerberus back alive — a task meant to be impossible. Before descending, Heracles was initiated into sacred rites that prepared him to walk among the dead. Guided by Hermes and aided by Athena, he entered the realm of Hades through a cavern in the earth.
There he encountered the imprisoned heroes Theseus and Pirithous, and in some tellings freed at least one of them. Then Heracles approached Hades and asked permission to take Cerberus. The god agreed on one condition: Heracles must subdue the beast without using iron weapons.
Heracles seized the monster with his bare strength, shielding himself with the lion skin he wore. After a violent struggle he forced Cerberus into submission, chained him, and dragged him up from the world of the dead.
When Cerberus first emerged into the sunlight, the sight drove him into a frenzy. Some say his foam or bile fell upon the earth and gave rise to poisonous plants. Heracles carried the beast across the land and displayed it before Eurystheus, proving the labor complete.
Once the task was fulfilled, Cerberus was returned to his post at the gates of the underworld, where he remains, the eternal watcher between the realms of the living and the dead.
Tradition / Region:Irish Mythology Alternate Names: Shalinnis, Salinnis, Fer Mac Category: Dog
The Myth
Failinis was a marvelous hound belonging to Lugh Lámhfhada of the Tuatha Dé Danann. The dog was one of the great treasures demanded as reparation from the sons of Tuireann after they killed Lugh’s father, Cian.
The hound originally came from the distant land of Iruaid, where it belonged either to a king or a royal smith. From there it passed into the hands of the sons of Tuireann, who were forced to surrender it to Lugh as part of their punishment.
Failinis was no ordinary dog. It was invincible in battle and could catch any beast it pursued, whether on land or in water. It held mastery over animals and was said to hunt everything from deer to fish. It possessed wondrous magic as well: whenever it bathed in running water, the water turned into wine or mead. In some tellings, it could even disgorge drink, gold, or silver from its mouth.
By day, the hound was immense and powerful, strong enough to overcome many warriors. By night it was like a bolt of fire, blazing and swift. Some tales describe it as beautifully colored, others as patterned in many hues — white, black, blue, and more.
In later stories of the Fenian Cycle, the same hound appears again, now in the hands of three foreign warriors from Iruaid who arrive in Ireland. They use the dog’s magic to create strong drink and defend themselves against spies. When warriors attempt to watch them in secret, the hound raises a supernatural wind with its tail that strips their weapons away. At its masters’ command it breathes upon the slain, reducing their bodies to dust so that nothing remains.
In some versions, the foreign warriors eventually lose the hound as compensation to the Fianna led by Fionn mac Cumhaill. In another telling they swear never to take the dog alive from Ireland, so they kill it and carry away its hide instead.
Thus Failinis is remembered as one of the great mythic hounds of Ireland — a creature of battle, magic, wealth, and loyalty, tied to heroes, kings, and warriors across multiple cycles of legend.
The Căpcăun is a monstrous being from Romanian tradition, remembered as one of the great enemies of humankind. It is counted among the dark creatures of folklore alongside dragons and ogres, and is often portrayed as a kidnapper of children, maidens, or princesses.
The creature’s name is believed to mean “dog-head,” and it is most often described as having the body of a man but the head of a dog. In some tales it is even more grotesque: it may have four eyes, eyes in the back of its head, or other unnatural features that mark it as something outside the human world.
The Căpcăun dwells in remote places — forests, caves, or distant lands — and is known above all for its hunger for human flesh. Stories tell of it capturing travelers or seizing the young and defenseless, carrying them away to be devoured.
In Romanian storytelling, the Căpcăun often appears as an obstacle for heroes to overcome, a symbol of brute strength, cruelty, and savagery. Its presence marks the boundary between the safe human world and the dangerous wilderness beyond.
Because of this, the word itself eventually came to be used not only for monsters but also as a name for hostile outsiders or enemies, reflecting how deeply the image of the dog-headed devourer took root in the imagination.
