Why ancient Japanese households feared the transformation of aging pets

Ideas & Philosophy · Published 2 October 2026 Swipe more like this →

In short: In Japanese folklore, a domestic cat does not merely grow old; it undergoes a sinister metamorphosis. As tails split and spirits swell, the familiar pet becomes a nekomata—a malevolent entity capable of necromancy, shapeshifting, and even consuming humans.

The nekomata exists in two distinct folkloric forms: the mountain beast and the transformed domestic pet. While the mountain variety is often described as a massive, dog-like predator, the domestic version arises from cats that have lived long enough to develop multiple tails. This transformation was so feared that a folk belief developed suggesting cats should not be kept for long periods, and some even went so as far as to clip kittens' tails to prevent the split from occurring.

Distinguishable from the more playful bakeneko, the nekomata is characterized by profound malice. Historical accounts, such as the 1233 entry in the Meigetsuki, describe a mountain nekomata in Nara Prefecture that killed and ate several people in a single night. As these creatures age, their power grows. They are said to possess the ability to perform necromancy, using ritualistic dances to control the dead, and may even haunt humans by manifesting as deceased relatives to seek revenge.

The origins of the name and nature of the creature remain subjects of scholarly debate. While 'mata' is commonly thought to refer to the 'two' (mata) tails, other theories suggest it refers to the 'repetition' of aging, or even the way old cats shed skin on their backs to create a bifurcated appearance. Some even link the legend to the Chinese xiānlí, a leopard cat that gains spiritual power and shapeshifts into humans. Whether a literal monster or a metaphor for rabies, the nekomata remains a potent symbol of the thin veil between the domestic and the demonic.

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