In the West they're called "Foo Dogs," but they're neither dogs nor "Foo": they're guardian lions. In Japan they're called komainu (狛犬), the "lion-dogs," and they stand guard in pairs at the entrance of shrines and temples. Their role is simple and ancient: to hold the threshold and keep evil out. They're cousins of the Inari foxes, the Niō and the onigawara: the wider family of Japanese guardians stationed at boundaries.
Workshop note: at Dai Yokai, I use the komainu and Foo Dog codes as a starting point for handmade decorative pieces, printed in PETG, sanded, painted and varnished in my workshop in Brittany, France. The aim is not to copy a temple statue, but to make a guardian figure that works in a modern home.
Where they come from
The motif isn't Japanese in origin. It comes from the Chinese guardian lion, itself descended from the lions of Indian art that arrived with Buddhism, and which travelled to Japan where it settled in during the Heian period. Since lions don't exist in the archipelago, the animal was stylised into a half-lion half-dog creature, the komainu. Originally the two guardians were distinct: one was a lion (shishi), mouth open, the other a komainu, mouth closed and sometimes bearing a horn. Over time the distinction blurred, and today "komainu" commonly refers to the whole pair.
The secret of the pair: open mouth, closed mouth
This is the detail that matters. Komainu always come in twos, and one has its mouth open while the other has it shut. It's no accident: the first utters the sound "a," the second the sound "un." Together they form the A-Un (阿吽), the equivalent of alpha and omega, the beginning and end of all things, a concept from Sanskrit. The open-mouthed guardian repels evil spirits, the closed-mouthed one keeps good energies in. That's why they're never separated: a single komainu tells only half the story.
And the Okinawan shīsā
In Okinawa, the same principle produced the shīsā (シーサー), guardians found perched on roofs or on either side of gates. Again they come in pairs, one mouth open, one closed, watching over the home against misfortune. It's one of the most recognisable images of the Okinawan islands.
How to place them at home
The placement logic follows their function. You set them in a pair, on either side of an entrance, a fireplace, a piece of furniture or a screen, never alone. Convention puts the open-mouthed guardian on the right and the closed-mouthed one on the left as you face them. Like all threshold guardians, they make full sense at a point of passage, where they can "filter" what comes in.
FAQ
What is a Foo Dog?
"Foo Dog" is the Western name for the guardian lions of Chinese origin, called komainu (lion-dogs) in Japan. They're neither dogs nor demons, but guardians stationed in pairs at the entrance of shrines and temples to repel evil.
Why does one have its mouth open and the other closed?
The open-mouthed one utters the sound "a," the closed-mouthed one "un": together they form the A-Un, the beginning and end of all things. One repels evil, the other keeps good energies in. That's why they always come in twos.
What's the difference between komainu and shīsā?
Both are Japanese guardian lions on the same open-mouth / closed-mouth pair principle. The komainu guards shrines and temples across Japan; the shīsā is its Okinawan version, often placed on roofs and house gates.
How do you place a pair of Foo Dogs at home?
Always in twos, on either side of an entrance or a piece of furniture, never isolated. Convention puts the open mouth on the right and the closed mouth on the left as you face them. They're made to guard a point of passage.