Almost everything people know about the Chinese zodiac comes from one story: the Great Race. The Jade Emperor invites twelve animals to race across a river, the Rat tricks the Ox, and the finishing order becomes the zodiac. It's a great story. It also has very little to do with where the zodiac actually came from.
The race story is much later than the zodiac
The race narrative is generally dated to the Song or Yuan dynasty — roughly a thousand years after the first surviving zodiac lists. The zodiac itself is older, and it didn't start as a folk tale. It started as a calendar system.
That distinction matters. When you read that the Pig is "there because of where it finished in the race," you're reading a story invented long after the fact to explain an ordering that already existed for other reasons.
What the excavated texts show
The earliest evidence for animals paired with the twelve earthly branches comes from bamboo slips buried in Qin-era tombs — not from any transmitted text.
Shuihudi Qin slips (睡虎地秦简)
Unearthed in 1975 in Yunmeng, Hubei, and dated to the late Warring States to Qin period (roughly 3rd century BCE). The divination section known as the Day Book (日书) contains a list of twelve animals assigned to the twelve branches — one of the oldest such lists known.
Fangmatan Qin slips (放马滩秦简)
Found in Tianshui, Gansu, from about the same era. This list differs from the Shuihudi one in a few places — evidence that the animal set was still settling, not yet fixed.
Wang Chong's Lunheng (论衡)
By the Eastern Han dynasty (1st century CE), the philosopher Wang Chong records a complete system of twelve branches matched to twelve animals — and it matches the modern zodiac almost exactly. If you want a single date for "the zodiac as we know it," this is the best candidate.
In short: the animal list appears in archaeological records centuries before the race story, and its final form is documented in a Han dynasty philosophical text. The race is folklore about the zodiac, not the origin of it.
The pig closes the zodiac because it owns 亥 (21:00–23:00), the last hour of the day — the animal of the cycle's end, right before the rat begins it again.
The character 猪
The classical character is 豕 (shǐ) — a pig drawn in profile with a fat body and short legs. 猪 (zhū) is the later, everyday form, pairing the animal radical 犭 with 者 for the sound. 豕 still appears inside other characters, most famously in 家 (home), which is a roof with a pig under it.
The pig in Chinese culture
Wealth you can eat
For most of Chinese history, a pig was the household's savings account: it turned scraps into meat, it bred, and it could be sold when cash was needed. A family with a pig was a family getting by.
The pig in 家
The character 家 (home) is 宀 (a roof) over 豕 (a pig). The most common explanation — that a roof with a pig under it meant a settled, provisioned household — is the reason pig imagery carries connotations of prosperity rather than dirt.
Zhu Bajie
西游记 gives the pig a starring role as well: 猪八戒, the pig companion on the journey west, is gluttonous, lazy, and oddly endearing — one of the most recognisable characters in Chinese popular culture.
猪 in everyday Chinese
The animal turns up constantly in idiom:
- 猪朋狗友 (zhū péng gǒu yǒu) — "pig friends and dog friends" — bad company (a variant of 狐朋狗友)
- 泥猪瓦狗 (ní zhū wǎ gǒu) — "mud pig, tile dog" — something worthless
- 猪八戒照镜子 (zhū bā jiè zhào jìng zi) — "Zhu Bajie looking in a mirror" — a xiehouyu (two-part saying) meaning to be ugly inside and out
A note on years: every year on this page is a lunar year. A zodiac year begins at Chinese New Year — between late January and mid-February — not on January 1.
Go deeper: the calendar behind the pig →The zodiac as a timekeeping system — why the pig is paired with 亥, what its hour means, and how the 60-year cycle works.