From a canny look to a quizzical grumble, dogs have long conveyed the impression they know more about what their owners are up to than what might be expected. Now researchers have found fresh evidence of canine savviness, revealing dogs seem to be able to tell whether human actions are deliberate or accidental. While theory of mind – the ability to attribute thoughts to others and to recognise that can result in certain behaviours – is often thought to be uniquely human, the study suggests at least some elements may be common to canines. “Our findings provide important initial evidence that dogs may have at least one aspect of theory of mind: the capacity to recognise intention-in-action,” the authors write, noting among other animals to show such an ability are chimpanzees, African grey parrots and horses. Previous research has suggested dogs can track human attention to decide when to snaffle food, and respond to pointing gestures. Additionally, many dogs get excited over certain cues that may hint at a forthcoming action – such as when a leash is picked up. However, experts say it was unclear whether dogs really grasp the notion of human intention. Writing in the journal Scientific Reports, scientists in Germany describe how they sought to unpick the issue by asking a researcher to pass treats to a dog through a gap in a screen. During the process the researcher tested the dog on three conditions: in one they attempted to offer a treat but “accidentally” dropped it on their side of the screen and said “oops!”, in another, they tried to offer a treat but the gap was blocked. In a third, the researcher offered the treat, but then suddenly withdrew it and said: “Ha ha!” “The idea of this experiment is that in all three situations they don’t get the food for some reason,” said Dr Juliane Bräuer, co-author of the research from Max Planck Institute for the Science of Human History, adding that the key difference is whether that is down to the treat is being intentionally withheld or – at least apparently – not. The results, based on analysis of video recordings of 51 dogs, reveal that the dogs waited longer before walking around the screen to get the treat directly in the case of the sudden withdrawal of the morsel than for the other two situations. They were also more likely stop wagging their tail and sit or lie down. The team writes that the dogs clearly show different behaviour between the different conditions. “This indicates that dogs indeed distinguish intentional actions from unintentional behaviour,” they write. However, they note further work is needed to explore whether dogs may have previously learned not to approach food that is withdrawn, or were responding to the different exclamations from the researcher. Dr Suilin Lavelle, a lecturer in philosophy at the University of Edinburgh, who was not involved in the study, said that while dog-owners may find the outcome unsurprising, it is far from trivial. “Distinguishing between intentional and non-intentional behaviour within one’s species brings critical survival advantages; being able to generalise this to another species, albeit one that co-evolved with you lends further support to the claim that dogs are distinguishing the behaviours based on their intentions rather than some other cue,” she said. While Lavelle said it was right the authors were cautious about how this ability is acquired, and noted it was possible dogs less familiar with humans might not make the same distinction, she said demonstrating the ability in domesticated animals was nevertheless a promising start. But, Lavelle said: “Whether this ability is sufficient to attribute theory of mind to dogs is a more vexed question, as researchers debate just what level of understanding of another’s psychological states is required to merit this label.”