Animal Idioms: 馬, 犬, 猫, 虎
Japanese animal idioms are fixed 慣用句 (kan'yōku, idiomatic phrases) that map animal behavior onto human temperament, status, and circumstance. Four animals carry the densest clusters: 馬 (horse), 犬 (dog), 猫 (cat), and 虎 (tiger). Learning each idiom as a whole unit lets 馬が合う read instantly as "we click" and 猫の手も借りたい as "run off our feet," rather than as a puzzle of separate words.
This reference is organized by animal. Each idiom gets a reading, a literal gloss (what the words say), its real idiomatic meaning, and a usage note on register and typical use.
Overview
A 慣用句 is a phrase whose meaning is not the sum of its parts. The animals here, 馬, 犬, 猫, and 虎, are basic vocabulary that many learners already know. But the phrases built on them carry meanings you cannot reach by translating word by word.
The payoff is leverage. Once you see the pattern, dozens of separate phrases start to feel like variations on a few themes: 馬 tends toward effort and temperament, 犬 toward loyalty and low status, 猫 toward fickleness and smallness, and 虎 toward fearsome power.
Why animals power so many idioms
In Conceptual Metaphor Theory, abstract ideas are often understood through concrete source domains, and the mapping runs from concrete to abstract.1 Animals are familiar and vivid in behavior, so they make a useful concrete source domain for human qualities a speaker wants to name quickly.1
The same metaphor logic that powers the body-part idioms in "Japanese Body-Part Idioms: 手, 目, 口, 心 Expressions" runs on animals here: a concrete source domain mapped onto an abstract meaning. Only the source domain changes: hands and eyes there, beasts here.
Japanese builds dozens of everyday idioms on a handful of animals. The idea that it leans especially heavily on animal imagery, compared with other languages, is useful framing rather than a measured fact. This article does not assert a corpus count, and the four anchor mappings are an organizing device for this reference, not a dictionary taxonomy.1
The four anchors each cover different territory: 馬 for effort, temperament, and compatibility; 犬 for loyalty, betrayal, and low status; 猫 for fickleness, smallness, and false fronts; 虎 for fearsome power and borrowed authority. The 虎 cluster is largely Chinese-derived, since the tiger is not native to Japan and its idioms arrived through the written classics.234
Phrasal idioms vs. proverbs: what belongs here
A 慣用句 is a fixed multi-word phrase whose whole meaning is not literal. It is not a standalone moral, which is a ことわざ (proverb), and not a four-kanji compound, which is a 四字熟語 (yojijukugo). This article catalogs the phrasal type built on animals, such as 馬が合う and 犬猿の仲.
Full proverbial sentences that happen to feature animals, such as 猿も木から落ちる and 蛙の子は蛙, live in the proverb reference, not here. This article gives only the one-line distinction above. For the full boundary between the three categories, see "Kotowaza: Japanese Proverbs".
How to read this reference
Each entry below gives the idiom with its reading, a literal gloss, the idiomatic meaning, and a usage note (register, typical situation, common collocation). The literal gloss is the memory bridge: it shows the concrete animal image that the abstract meaning grows out of.
One point carries the whole reference: the particle and the fixed verb are part of the idiom, not a free choice.
The entries use a labeled definition-list layout rather than a wide table because each idiom needs a usage note longer than a table column would hold comfortably.
馬 (horse): effort, temperament, and dubious origins
The horse is a working animal that a rider has to suit. It gives idioms about compatibility and wasted effort, plus one sharp insult about unknown background.
馬が合う (うまがあう, uma ga au)
- Literal: the horses match or fit.
- Meaning: to get along well; to hit it off; to be temperamentally compatible.5
- Usage: everyday, neutral-to-warm. The image is a rider and horse suiting each other. The negative 馬が合わない ("we don't gel") is just as common. The sourced example below uses that negative form.
彼女とは馬が合わなかったんだよ。7
"I just didn't get along with her."
馬の耳に念仏 (うまのみみにねんぶつ, uma no mimi ni nenbutsu)
- Literal: a Buddhist invocation in a horse's ear.
- Meaning: reciting a sacred prayer to a horse is pointless. By extension, however much you advise someone, it has no effect.8
- Usage: common, with a slightly literary flavor but still used in speech. It describes wasted advice, often as 〜は馬の耳に念仏だ. Reference dictionaries tag it 慣用句, though because it carries a lesson it can also be classed as a proverb.9
彼に忠告したところで、馬の耳に念仏だよ。7
"Even if you advise him, it's like talking to a brick wall."
馬の骨 (うまのほね, uma no hone)
- Literal: a horse's bone.
- Meaning: a contemptuous term for someone whose background or origin is unknown.10
- Usage: derogatory, typically どこの馬の骨（だ／かわからない）. It carries built-in disdain, especially in marriage and family-background contexts, so it is not for polite description.
「手塩にかけて育てたうちの芽衣をどこの馬の骨かもわからないような奴に、ほいほいやれるか！」7
"You think I'd just hand over my Mei, whom I raised with such care, to some nobody from who knows where?"
犬 (dog): loyalty, betrayal, and low status
Dog idioms run in two directions: the loyal companion whose betrayal stings most, and the low-status animal whose name marks a death or quarrel as worthless.
犬猿の仲 (けんえんのなか, ken'en no naka)
- Literal: the relationship of dog and monkey.
- Meaning: a relationship as antagonistic as a dog and a monkey. In practice, being on very bad terms.11
- Usage: very common and neutral-descriptive, as AとBは犬猿の仲（だ）. There is no verb to conjugate; it works as a noun predicate. English flips the animals to "like cats and dogs," but Japanese pits dog against monkey.
The sourced example is literary. It comes from Inoue Hisashi's 1971 novel 『烈婦！ます女自叙伝』, quoted in the dictionary entry: 「某先生と犬猿の仲でありライバルでもあった歌人を激怒させ」 ("infuriating a poet who was both his rival and on dog-and-monkey terms with a certain teacher").11
飼い犬に手を噛まれる (かいいぬにてをかまれる, kaiinu ni te o kamareru)
- Literal: to have one's hand bitten by the dog one keeps.
- Meaning: to be betrayed and badly hurt by someone you have long looked after.12
- Usage: common, with a strong sense of betrayal. The passive 噛まれる is fixed because the speaker is the victim. The past form 飼い犬に手を噛まれた is frequent.
飼い犬に手をかまれた気分だよ。7
"I feel like I've been bitten by my own dog."
犬死に (いぬじに, inujini)
- Literal: a dog's death.
- Meaning: to die in a way that serves no purpose; a pointless, wasted death.13
- Usage: somber, as 犬死に（する／させる）. The low-status sense of 犬 drives the image: a dog's death is a worthless one.
志半ばで斃れた彼を犬死にさせるな。13
"Don't let him, struck down with his goal unfinished, have died for nothing."
猫 (cat): fickleness, smallness, and false fronts
The cat is the richest cluster, and it shows an ambivalent view of cats: prized but useless paws, value the animal cannot grasp, a demure front it only pretends to wear, and a small forehead standing in for any cramped space.
猫の手も借りたい (ねこのてもかりたい, neko no te mo karitai)
- Literal: to want to borrow even a cat's paw.
- Meaning: extremely busy and short-handed, wanting any help at all.14
- Usage: very common and conversational. A cat's paw is proverbially useless, so the point is that even that would help. Often used as 〜ほど忙しい.
猫の手も借りたいほど忙しい。7
"I'm so busy I'd take help from anyone."
年末は猫の手も借りたいほど忙しくなる。7
"At year-end we get so busy we'd welcome any pair of hands."
猫に小判 (ねこにこばん, neko ni koban)
- Literal: a koban (gold coin) to a cat.
- Meaning: giving something precious to someone who cannot grasp its value.15
- Usage: very common, as AにBは猫に小判だ, working as a noun predicate. The 小判 is an Edo-period oval gold coin, and the expression is Edo-period in origin.15 Reference dictionaries tag it 慣用句. Proverb dictionaries also list it as a ことわざ.
それじゃ猫に小判だ。7
"That would be casting pearls before swine."
君のせっかくの名講義は猫に小判だったね。7
"Your wonderful lecture was wasted on them, pearls before swine."
猫をかぶる (ねこをかぶる, neko o kaburu)
- Literal: to put on or wear a cat.
- Meaning: to hide one's true nature and feign a meek, gentle character.6
- Usage: very common, conversational, and mildly critical, as 猫をかぶっている. It often describes someone acting demure in front of others while their real character is different.6
猫の額 (ねこのひたい, neko no hitai)
- Literal: a cat's forehead.
- Meaning: based on the narrowness of a cat's forehead, a metaphor for a very small or cramped space.16
- Usage: very common and neutral, often self-deprecating about your own small garden or plot of land, as 猫の額ほどの〜.
猫の額ほどの庭。16
"A garden no bigger than a cat's forehead."
猫舌 (ねこじた, nekojita)
- Literal: cat-tongue.
- Meaning: based on cats disliking hot food, being unable to eat or drink hot things. Also, a person who is like this.17
- Usage: very common, conversational, and light, as 猫舌だ or 猫舌なんです. There is no clean single-word English equivalent, so it has to be glossed.
虎 (tiger): power, ferocity, and borrowed authority
The tiger is not native to Japan, so its idioms arrive through Chinese classics. Each entry includes a 出典 (classical source) line below. That foreign-origin route is the section's "borrowed beasts" point: the animal need not be native for its idiom to be fully naturalized.
虎の威を借る狐 (とらのいをかるきつね, tora no i o karu kitsune)
- Literal: a fox that borrows the tiger's authority.
- Meaning: a petty person who acts important by relying on someone else's power.2
- 出典: from the Zhanguo ce (Strategies of the Warring States), Chu section. In the fable, a tiger catches a fox. The fox claims Heaven made it king of beasts and dares the tiger to follow behind. The other animals flee, in fact from the tiger, and the tiger, fooled, lets the fox go.2
- Usage: common and widely understood, though literary-tinged, often as 〜の威を借る狐.
虎の巻 (とらのまき, tora no maki)
- Literal: the tiger scroll, or tiger volume.
- Meaning: a secret manual of military strategy; a book of a discipline's secret arts; and, in everyday use, a crib book, answer key, or study cheat sheet (あんちょこ).3
- 出典: from the "Tiger" (虎韜) volume of the Zhou-era military classic Liutao (六韜).3
- Usage: common in the study-crib sense. In that use, it is neutral with a mild slangy edge (close to あんちょこ, a crib note, or 攻略本, a strategy guide).
虎の子 (とらのこ, tora no ko)
- Literal: a tiger's cub.
- Meaning: something one treasures and will not let go of; cherished money or goods, especially guarded savings.18
- Usage: common and neutral-positive, from the way tigers dote on their cubs.18 Often 虎の子の〜, as in 虎の子の貯金 (precious savings). The dictionary's example is 虎の子の財布, a treasured nest-egg purse.18
虎視眈々 (こしたんたん, koshi tantan)
- Literal: tiger-gaze, glaring intently.
- Meaning: a tiger fixing sharp eyes on prey. By extension, watching intently for one's chance.4
- 出典: from the Yijing (Book of Changes), the Yi (頤) hexagram.4
- Usage: common, as 虎視眈々と（機会を）狙う. It is slightly literary and carries a menacing connotation. In form, it is a 四字熟語 used adverbially with と.
彼は競争相手を落とし入れようと虎視眈々としている。4
"He's lying in wait, watching for his chance to take down his rival."
Other animals worth knowing
Beyond the four anchors, a handful of other animals carry idioms common enough to recognize on sight. The list below gives one or two for each animal, while keeping the four anchors as the depth of the reference.
The proverb-form animal sayings, such as 蛙の子は蛙, 井の中の蛙大海を知らず, 猿も木から落ちる, and 河童の川流れ, are full sentences with a moral. They belong to "Kotowaza: Japanese Proverbs", not here.
猿真似 (さるまね, sarumane)
- Literal: monkey-imitation.
- Meaning: mindlessly imitating others, the way a monkey copies human movements.19
- Usage: dismissive and mildly critical, as 〜の猿真似. The dictionary example is the blunt 猿真似は止せ ("quit the mindless copying").19
……それはただの猿真似でしかないんだ。7
"...that's nothing but hollow imitation."
狐につままれる (きつねにつままれる, kitsune ni tsumamareru)
- Literal: to be pinched or picked at by a fox.
- Meaning: to be bewitched by a fox; to be left dumbfounded by something unexpected.20
- Usage: common, almost always as 狐につままれたような〜. The example phrase 狐につままれたような顔 means "a dumbfounded look."20 It plays on the folklore of fox spirits deceiving people.
狐と狸の化かし合い (きつねとたぬきのばかしあい, kitsune to tanuki no bakashiai)
- Literal: a contest of deception between a fox and a raccoon-dog.
- Meaning: two cunning parties each trying to outfox the other.21
- Usage: colorful and conversational, as 彼らは狐と狸の化かし合いだ.21 Both 狐 and 狸 are folklore shape-shifters, so both sides are trying to deceive the other.
雀の涙 (すずめのなみだ, suzume no namida)
- Literal: a sparrow's tears.
- Meaning: a metaphor for an extremely tiny amount.22
- Usage: very common, often of money or salary, as 雀の涙ほどの〜. The dictionary phrase 雀の涙ほどの退職金 means "a pittance of a retirement payout."22
ここの給料は、雀の涙程度よ。7
"The pay here is next to nothing."
水を得た魚 (みずをえたうお, mizu o eta uo)
- Literal: a fish that has obtained water.
- Meaning: thriving and lively once in a situation that suits you; in your element.23
- Usage: very common and positive, as 水を得た魚のように〜. In casual speech, it is also read みずをえたさかな.
映画の話になると彼は水を得た魚のようだ。23
"Get him onto films and he's like a fish in water."
蛇足 (だそく, dasoku)
- Literal: legs on a snake.
- Meaning: a needless addition; something extra and useless.24
- 出典: from the Zhanguo ce (Qi section). In a contest to draw a snake fastest, the man who finished first kept going and added legs, and so lost.24
- Usage: common and neutral-to-formal, often self-deprecating as 蛇足ながら〜 ("if I may add a needless aside").
牛の歩み (うしのあゆみ, ushi no ayumi)
- Literal: an ox's pace.
- Meaning: a metaphor for very slow progress.25
- Usage: somewhat literary, as 牛の歩みのように遅い. The same image drives 牛歩 (ぎゅうほ) in the political term 牛歩戦術, the slow-walking tactic.
Good to know
Some animal expressions are proverbs, not idioms
The same animal wording can sit in different categories. 馬が合う, 犬猿の仲, and 猫の手も借りたい are phrasal 慣用句 and belong here.1114 猿も木から落ちる and 蛙の子は蛙 are full ことわざ, or proverb sentences with a moral, and live in "Kotowaza: Japanese Proverbs."
Two anchor items straddle the line by dictionary label. This article keeps them as phrasal because their surface form is a phrase, not a sentence: 馬の耳に念仏 is tagged 慣用句 but is also classifiable as a proverb,9 and 猫に小判 is tagged 慣用句 yet is also listed as a ことわざ in proverb dictionaries.15 The honest description is dual classification, not a clean split.
One sentence-shaped tiger expression falls clearly on the proverb side and is not cataloged here: 虎穴に入らずんば虎子を得ず ("nothing ventured, nothing gained") is a 故事成語 in full proverbial-sentence form. It lives in the proverb reference.26
Borrowed beasts: idioms that came from China
The tiger is not native to Japan, and its idioms entered the language through the written classics. 虎の威を借る狐 comes from the 戦国策 (Chu section),2 虎の巻 from the 虎韜 volume of the 六韜,3 and 虎視眈々 from the 易経 頤卦.4 蛇足 likewise comes from the 戦国策 snake-drawing fable.24
These are 故事成語, expressions whose meaning rests on a classical anecdote. Yet each is phrasal in shape (a noun, a noun phrase, a four-character adverbial) rather than a full proverbial sentence, which is why they stay in this article. The animal need not be native for its idiom to be fully naturalized in Japanese.
Register: which are safe in everyday speech
Several entries are conversational and neutral, so they are safe to use freely: 馬が合う,5 犬猿の仲,11 猫の手も借りたい,14 猫をかぶる,6 猫の額,16 and 猫舌.17
Others carry built-in judgment and are not neutral descriptors. 馬の骨 is contemptuous,10 猿真似 is dismissive,19 飼い犬に手を噛まれる carries a heavy sense of betrayal,12 and 犬死に is somber.13 Do not use these casually about a real person.
A third group is slightly literary but still common in speech: 馬の耳に念仏,8 虎視眈々,4 and 牛の歩み.25
See also
- Japanese Body-Part Idioms: 手, 目, 口, 心 Expressions
- Kotowaza: Japanese Proverbs
- Yojijukugo (四字熟語): The Japanese Four-Character Idioms Explained
- Yojijukugo: Reading and Using Four-Character Idioms
- Top 50 Yojijukugo for N2: Readings, Meanings, Examples
- How Japanese Slang Works: Semantic Shift, Clipping, and Net-Speak