Can Dogs Tell When People Are Lying? Study Of 260 Dogs
Uncover the science behind whether dogs can detect human deception through groundbreaking University of Vienna research.
Dogs possess a remarkable ability to discern when humans provide misleading information about food locations, according to a comprehensive study involving 260 dogs conducted by researchers at the University of Vienna. In controlled experiments, dogs frequently ignored false suggestions from human communicators, particularly when they had witnessed the true location of treats, suggesting an awareness of human deception.
How the Experiment Worked
The study adapted classic change-of-location tasks previously used with human infants and apes to test dogs’ sensitivity to human true beliefs (TB) versus false beliefs (FB). Dogs watched as food was placed in one of two opaque buckets, then observed scenarios where a human informant either knew or did not know the food’s final position.
- In the first phase, dogs familiarized themselves by following reliable advice from an unfamiliar human communicator who pointed to the correct bucket containing a treat.
- Researchers then introduced deception: an experimenter moved the treat while the communicator was absent (creating a false belief) or present but pointing incorrectly despite knowing the truth.
- Dogs chose buckets based on the communicator’s suggestion versus their own knowledge.
Results showed that over half of the dogs (51%) did not follow suggestions when the communicator had a false belief, as they realized she lacked updated knowledge. Notably, two-thirds (67%) ignored pointers who knowingly misled them by indicating the empty bucket.
Key Findings from the Study
The experiments revealed dogs’ nuanced understanding of human knowledge states, outperforming young children and apes in similar tests.
| Condition | Dogs Ignoring Suggestion (%) | Comparison to Other Species |
|---|---|---|
| False Belief (Communicator Absent) | 51% | Young children and apes more likely to follow |
| True Belief but Deceptive Pointing | 67% | Dogs showed strongest discrimination |
| Control True Belief | Low ignorance (followed advice) | Consistent reliability judgment |
These percentages highlight dogs’ reluctance to trust unreliable informants, attributing intentions based on observed events.
Do All Dogs Perform the Same? Breed Differences Emerge
While most dogs demonstrated deception awareness, breed groups varied significantly. Cooperative breeds like retrievers, border collies, and molossoids aligned with the majority, ignoring misleading cues effectively.
- Terriers: Behaved oppositely, following false suggestions more like human infants under five and great apes, possibly due to independent working histories.
- Border Collies: Performed similarly to the general sample, though not always statistically distinct.
- Researchers speculate artificial selection for cooperative work enhanced deception detection in herding and pointing breeds.
A follow-up experiment with terriers and border collies replicated these patterns, suggesting evolutionary pressures shaped cognitive skills for human partnership.
Interpreting the Results: What Does It Mean for Dog Cognition?
Dogs’ performance indicates they track human visual access to events and infer knowledge gaps, extending beyond mere behavior-reading to mental state attribution. Co-author Ludwig Huber noted, “Dogs might think, ‘This person has the same knowledge as me, and is nevertheless giving me the wrong information.’ It’s possible they could see that as intentionally misleading, which is lying.”
This challenges prior views equating dogs with pre-verbal children or primates. Unlike apes, who blindly followed deceivers, dogs adjusted based on informant reliability, echoing studies on trustworthiness discrimination. Factors like retroactive interference were ruled out, as control conditions yielded consistent results.
Broader Implications for Human-Dog Relationships
With over 14,000 years of cohabitation, dogs evolved socio-cognitive skills attuned to human cues, including potential deception detection. This enhances their role as companions, as they prioritize accurate information in cooperative contexts.
Everyday examples include dogs hesitating at unreliable commands or preferring known treat spots despite owner misdirection. Such abilities underscore why dogs excel in detection work, reading communicative intentions reliably.
Limitations of the Research
While promising, the study focused on pet dogs in food-motivated tasks, limiting generalizability to non-reward scenarios or wild canids. Sample biases toward certain breeds and cooperative setups may inflate results. Future research should test independent workers like hounds and explore intentions explicitly.
Distraction or memory lapses were minimized, with 61.5% of dogs correctly recalling locations, confirming attentiveness.
Related Canine Cognitive Abilities
Dogs’ deception sensitivity aligns with strengths in gaze-following, facial expression reading, and voice tone interpretation. Their sense of smell, 1,000–10,000 times superior to humans, aids emotional state detection, potentially complementing lie discernment.
- Visual perspective-taking: Dogs adjust for human sightlines.
- Informant reliability: Ignore unhelpful experimenters.
- Emotional attunement: Respond to human stress via pheromones and cues.
Frequently Asked Questions (FAQs)
Can all dogs detect lies equally?
No, cooperative breeds like border collies outperform independent ones like terriers, per University of Vienna findings.
Do dogs understand lying like humans?
Dogs infer deception via knowledge states, possibly attributing intent, surpassing apes and young children.
Why do terriers differ in the study?
Their independent heritage may lead to less sensitivity to human deception cues compared to working breeds.
Can this be trained?
While innate, training reinforces reliability judgments, useful in detection roles.
What about everyday lying to dogs?
Dogs may ignore false commands if they know better, fostering trust in consistent owners.
Conclusion: Dogs as Keen Judges of Truth
Evidence affirms dogs can tell when people are lying in specific contexts, leveraging evolved cognition for human interaction. This deepens appreciation for their intelligence.
References
- Dogs know when people are lying — Big Think. 2021-07-20. https://bigthink.com/life/dogs-know-when-people-are-lying/
- Dogs follow human misleading suggestions more often when the informant has a false belief — Proceedings of the Royal Society B (PMC). 2021-07-14. https://pmc.ncbi.nlm.nih.gov/articles/PMC8292766/
- Can Dogs Tell If Someone Is a Bad Person? — Kinship. Accessed 2026. https://www.kinship.com/uk/dog-behaviour/can-dogs-tell-if-someone-is-a-bad-person
Similar Articles
Read full bio of medha deb
