頭（とう）counts large animals — cattle, horses, elephants, and other big beasts — and it comes with a gift most Japanese counters don't offer: a near-perfect English parallel. 頭 literally means "head," and English counts livestock the very same way in "twenty head of cattle." That shared metaphor makes 頭 unusually easy to remember, and it also gives you a clean way to reason about the small/large split with 〜匹 instead of memorising it by rote.
What 頭 counts
The core category is large animals — the ones you could not simply pick up and carry:
- Livestock: 牛（うし, cattle）, 馬（うま, horse）, 豚（ぶた, pig）, 羊（ひつじ, sheep）, ヤギ (goat)
- Big wild/zoo animals: ゾウ (elephant), キリン (giraffe), ライオン (lion), クマ (bear), パンダ
- Large working or guard dogs, and big cats, in more formal/technical contexts (see below)
牧場に牛が三頭いる。
bokujō ni ushi ga san-tō iru
There are three cows on the ranch.
動物園でゾウを一頭見た。
dōbutsuen de zō o ittō mita
I saw an elephant at the zoo.
この農家は馬を二頭飼っている。
kono nōka wa uma o ni-tō katte iru
This farm keeps two horses.
"Head of cattle" — the parallel that does the work
Stop and appreciate this, because it's rare. Japanese 頭 and English "head" are the same idea: count a large animal by its head. English says "a herd of two hundred head of cattle" (note: "head," not "heads" — it stays singular, much as a Japanese counter has no plural). Japanese says 牛二百頭. The metaphor even shares the register instinct: in English, "head of cattle" sounds like a rancher or an auctioneer, and in Japanese 頭 likewise leans formal, agricultural, and technical. A zookeeper, a vet, a livestock report, a news anchor covering a farm — those are the natural homes of 頭.
この牧場では羊を六頭飼育している。
kono bokujō de wa hitsuji o roku-tō shiiku shite iru
This ranch raises six sheep.
牛が全部で何頭いますか。
ushi ga zenbu de nan-tō imasu ka
How many cattle are there in total?
The readings — almost regular, with three geminates
頭 is t-initial, and t-counters are far calmer than the h-counters (本, 匹). There is no voicing at all — 三頭 stays a clean san-tō, never san-dō. The only changes are the standard geminations after 1, 8, and 10, where the number fuses into っ and doubles the t. Critically — and this is the trap for anyone coming from 本/匹 — 6 does NOT geminate here: 六頭 is a plain roku-tō.
| Number | Reading | What happened |
|---|---|---|
| 一頭 | いっとう (ittō) | gemination: ichi → i + tt |
| 二頭 | にとう (ni-tō) | — regular |
| 三頭 | さんとう (san-tō) | — regular, no voicing |
| 四頭 | よんとう (yon-tō) | — regular |
| 五頭 | ごとう (go-tō) | — regular |
| 六頭 | ろくとう (roku-tō) | — no gemination (unlike 六本 roppon) |
| 七頭 | ななとう (nana-tō) | — regular |
| 八頭 | はっとう (hattō) | gemination: hachi → ha + tt |
| 九頭 | きゅうとう (kyū-tō) | — regular |
| 十頭 | じゅっとう (juttō) | gemination (じっとう jittō is older) |
| 何頭 | なんとう (nan-tō) | "how many?" — no voicing |
このサファリパークには、ライオンが八頭います。
kono safari-pāku ni wa, raion ga hattō imasu
This safari park has eight lions.
今日のレースでは馬が十頭走った。
kyō no rēsu de wa uma ga juttō hashitta
Ten horses ran in today's race.
上野動物園にパンダが二頭いる。
Ueno-dōbutsuen ni panda ga ni-tō iru
There are two pandas at Ueno Zoo.
The small/large split: reason it out, don't memorise it
The great thing about the 匹–頭 divide is that you can reason about it rather than memorise a list. The principle is size:
- Hand-holdable? → 匹 (cats, small-to-medium dogs, fish, insects)
- Too big to pick up? → 頭 (cattle, horses, elephants, giraffes, bears)
The genuinely gray zone is large dogs and big cats. A guide dog, a police dog, a big breed like a Great Dane, or a lion is frequently counted with 頭 in formal or professional contexts, while the family pet — even a large one — is usually 匹 in everyday speech. This isn't sloppiness; it tracks the register split. A vet's chart or a news report reaches for 頭; a neighbour chatting about the dog reaches for 匹.
盲導犬は、大きいので一頭と数えることもあります。
mōdō-ken wa, ōkii node ittō to kazoeru koto mo arimasu
Because guide dogs are large, they're sometimes counted with 頭.
うちの大型犬は、家では一匹って呼んでるけどね。
uchi no ōgata-ken wa, ie de wa ippiki tte yonderu kedo ne
At home, though, we just count our big dog with 匹.
Common mistakes
❌ 牛を三匹数える
Incorrect — cattle are large animals and take 頭 (三頭), not 匹.
✅ 牛を三頭数える
ushi o san-tō kazoeru
counting three cows
❌ ネコを一頭飼っている
Incorrect — a cat is small; use 匹 (一匹), not the large-animal counter 頭.
✅ ネコを一匹飼っている
neko o ippiki katte iru
I have one cat.
❌ 一頭を「いちとう」と読む
Incorrect — 一 geminates before 頭: いっとう ittō.
✅ 一頭＝いっとう
ittō
one (large animal)
❌ 八頭を「はちとう」と読む
Incorrect — 八 geminates: はっとう hattō.
✅ 八頭＝はっとう
hattō
eight (large animals)
❌ 六頭を「ろっとう」と読む
Incorrect — 頭 is t-initial, so 六 does NOT geminate; it stays ろくとう roku-tō.
✅ 六頭＝ろくとう
roku-tō
six (large animals)
That final pair is the subtle one and a real sign of counter mastery. After drilling 六本 roppon and 六匹 roppiki, learners over-generalise and produce rottō for 六頭. But 頭 is t-initial, where 六 doesn't geminate — so it's the plain ろくとう roku-tō. Knowing exactly when not to geminate is what separates a fluent counter from a memorised one; the full grid is on Counter Sound Changes.
Key takeaways
- 頭（とう）counts large animals: cattle, horses, elephants, and big zoo/farm beasts — literally "head," exactly like English "head of cattle."
- It's a calm counter: no voicing at all, and only 1/8/10 geminate — いっとう, はっとう, じゅっとう.
- 六頭 is regular roku-tō — 6 does not geminate before t, unlike 六本 roppon.
- The 匹–頭 split is by size and you can reason it out; big dogs and big cats float between the two, tracking formal (頭) vs everyday (匹) register.
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