Imagine this situation: you point to an empty bowl and convince your dog that the treat is right there. She might believe you once. But what happens if you trick her again?

It turns out that dogs aren’t as trusting as they might seem. They closely observe human behavior, remembering who gave them accurate information and who is best not to trust anymore.

But does that mean a dog actually understands when someone is lying?

If you trick a dog once, it’ll be skeptical next time

In one of the most famous experiments, a dog was shown two containers. A person pointed to the one containing food, and the dog found the treat.

Then the person would deliberately point to the empty container.

When that same person later correctly pointed out where the food was again, the dogs were much less likely to follow the cue. In other words, they took their previous experience into account and changed their attitude toward the source of information.

In fact, it was as if the dog had drawn the conclusion:

“You let me down last time. Why should I trust you now?”

This is particularly interesting because dogs usually respond very well to human gestures. They pay attention to the direction of a person’s gaze, body posture, and pointing gestures. But trust in a person isn’t entirely automatic—previous experience matters.

Of course, this doesn’t mean that a dog thinks about lying in the same way a human does. We can’t say for certain that a thought like “This person is a liar” pops into a dog’s head. But experiments show that dogs are capable of assessing a person’s trustworthiness and adjusting their behavior accordingly.

Dogs can distinguish between a mistake and a deliberate action

And this is where it gets even more interesting.

In another experiment, researchers tested whether dogs could tell the difference between situations where a person doesn’t want to give them food and situations where a person is unable to do so.

In one scenario, the experimenter deliberately took the treat back. In other scenarios, the person appeared to want to give the treat but accidentally dropped it or was physically unable to hand it over due to an obstacle.

The dogs’ behavior differed in these situations. The researchers concluded that dogs are capable, at least to some extent, of distinguishing between intentional and unintentional human actions.

In other words, for a dog, it may not only be the result that matters:

“I didn’t get a treat.”

The dog also pays attention to the circumstances:

“The person couldn’t give it to me” or “the person deliberately didn’t give it to me.”

And this alone makes the relationship between dogs and humans much more complex than a simple system of commands and rewards.

So does the dog really know that you’re lying?

The most honest answer: sometimes a dog can tell that your information is incorrect and may even stop trusting you, but that doesn’t prove that dogs understand the concept of lying.

In a large-scale experiment involving 260 dogs, the animals watched as food was transferred from one bowl to another. Then a person gave them an incorrect cue.

The dogs’ reactions depended on what the person giving the advice had actually seen. The study showed that the dogs took into account the person’s access to information and often ignored incorrect cues. At the same time, the authors cautiously note that the dogs’ behavior should not automatically be equated with a full human understanding of others’ beliefs or intentions.

And this raises a very interesting question:

“Perhaps a dog doesn’t understand the word ‘lie.’ But it doesn’t need to.”

It remembers:

  • who gave the right cues;
  • who turned out to be unreliable;
  • who shares food;
  • who only pretends to throw the ball;
  • and who has already said “let’s go for a walk” five times but is still sitting on the couch.

Dogs have lived alongside humans for millennia. Over this time, they have become extremely attentive observers of our behavior.

So the next time you pretend to throw the ball but keep it behind your back, remember: it might work the first time.

But dogs learn, too. And your reputation is already on the line.