IQ of a Horse: How Smart Are Horses, Really?
There's no actual IQ of a horse, because IQ tests are built for humans and scored against other humans. What research does show is that horses have strong long-term memory, can tell happy from angry human faces, and learn to use simple symbols to "ask" for things. They also gave science one of its biggest lessons, via a horse called Clever Hans, about how easy it is to fool yourself when testing intelligence.
If you've ever thought you knew an answer when you were actually just reading the room, IQ Tester shows what you really know versus what you guess: Find my weak spots.
What is the IQ of a horse?
Quick truth: any number you find for the average iq of a horse is made up. Here's the problem with "what's the iq of a horse":
- IQ is a ranking against people, on a scale where 100 is average and 15 is one standard deviation.
- Horses can't read, speak or draw, so the tasks don't translate.
- There's no big reference group of horses who all took the same test.
What we can ask instead is: what can horses do, and how does that compare to other animals? That's where it gets interesting.
Horse intelligence in one line
Horses are prey animals, so their brains are tuned for noticing, remembering and reacting, not for solving puzzles for fun. Different job, different smarts.
How smart are horses compared to humans
Adults? Not close. But horses do a few things that impress researchers:
- Long memory: horses can remember tasks and people over long periods. Many owners report a horse recognizing them after years apart, and studies on horse learning back up strong long-term memory.
- Reading faces: a 2016 study from the University of Sussex (published in Biology Letters) found horses reacted differently to photos of angry versus happy human faces.
- Remembering expressions: a 2018 study in Current Biology found horses responded more warily to a person they'd earlier seen with an angry expression.
- Communicating with symbols: a Norwegian study (2016, Applied Animal Behaviour Science) trained horses to touch symbols meaning "blanket on," "blanket off" or "no change," and their choices tended to match the weather.
That last one is wild. Horses telling you they're cold, basically.
Horse vs dog vs pig
The searches "how smart are horses compared to dogs" and "how smart are horses compared to pigs" come up constantly, so here's a straight comparison.
| Skill | Horse | Dog | Pig |
|---|---|---|---|
| Reading human emotions | Strong | Very strong | Some evidence |
| Long-term memory | Strong | Strong | Strong |
| Problem solving (puzzles) | Moderate | Strong | Strong |
| Learning commands | Strong | Excellent | Good |
| Social learning from others | Some | Strong | Strong |
Are horses smarter than dogs?
Not really in puzzle-style tasks, where dogs and pigs usually look sharper. But horses hold their own in memory and in reading body language. On iq of horse vs dog, call it a different kind of smart. For the pig side, our IQ of a pig post covers the video game study.
The Clever Hans lesson
This is the most important part of the post, honestly.
In early-1900s Germany, a horse named Hans seemed to do arithmetic. His owner would ask "what's 3 plus 2?" and Hans would tap his hoof five times. Crowds loved it. People believed he could do math, tell time and spell.
Then a psychologist named Oskar Pfungst tested him properly. He found:
- Hans got answers right only when the questioner knew the answer.
- If Hans couldn't see the questioner, he failed.
- Hans was watching tiny, unconscious cues (a slight relax in posture or face) that people gave off when he reached the right number.
So Hans wasn't doing math. He was reading humans, which is still impressive! But it means the "test" was measuring the wrong thing.
Why this matters for you
The Clever Hans effect is now taught in psychology classes because it happens to humans too. You "get" a question in class because the teacher's tone gives it away. You ace a quiz because you remembered the answer key, not the method. Then the real exam hits and the cues are gone.
That's the catch with judging your own ability: you can't tell how much was skill and how much was cues, luck or memory. IQ Tester removes the cues. You get 20 untimed questions on your own screen, harder ones counting for more, and a skip counts as wrong, so the result reflects what you can actually reason through. Find my weak spots
Memory and emotion reading in horses
The two biggest strengths in horse intelligence:
Memory
Horses remember routes, routines, and unpleasant experiences, which is why a horse that had a bad time at a certain gate may refuse it for ages. Trainers work with this memory, not against it.
Emotion reading
Horses are herd animals, so they're constantly scanning for mood. The face-reading studies above suggest that skill extends to humans. If you've ever felt a horse get tense when you're nervous, that's not in your head.
What this says about testing intelligence
The horse story gives you a checklist for any IQ test, quiz or "are you a genius?" TikTok:
- Is anyone giving hints? Good tests don't.
- Are there time tricks? Rushing can measure panic rather than reasoning.
- Do harder questions count more? They should; they tell you more.
- Does it give you a range, not a magic number? Real scores have error bars.
That's how you separate real reasoning from a Clever Hans moment. Rats get tested in mazes for the same reason (see our post on the IQ of a rat).
Skip the hoof taps, get a real read on your reasoning
Unlike the iq of a horse, yours can actually be measured on a human scale. Sign in to IQ Tester with Google or Apple and start 20 untimed questions in about a minute; your band and three of your four category strengths are free. It's for entertainment, not a clinical assessment, but it's a lot more honest than a crowd cheering for a horse.
FAQ
What is the average IQ of a horse?
There isn't one. IQ is a human scale built from human tests, so a horse can't get a real score. Online numbers are guesses.
How smart are horses compared to dogs?
Dogs usually do better on puzzle and command tasks and are excellent at reading people. Horses have strong long-term memory and can also read human faces. They're smart in different ways.
What was the Clever Hans horse?
Clever Hans was a German horse in the early 1900s who seemed to do math by tapping his hoof. Psychologist Oskar Pfungst showed he was reading tiny body-language cues from the questioner, not calculating.
Do horses remember people?
Research shows horses have strong long-term memory, and a 2018 study found they react to a person differently based on an expression they saw earlier. Many owners report horses recognizing them after long breaks.
Can horses read human emotions?
Studies suggest yes. A 2016 Sussex study found horses responded differently to angry versus happy human faces in photos.