Over our long shared history, dogs have developed a range of skills for bonding with human beings. Their ability to make sense of human actions, demonstrated by every ‘sit,’ ‘lay down,’ and ‘rollover,’ is just one skill. But whether dogs understand human intentions or merely respond to outcomes remains unclear.
The ability to recognise another’s intentions – or at least conceive of them – is a basic component of Theory of Mind, the ability to attribute mental states to oneself and others, long regarded as uniquely human. Do dogs have this basic component of the Theory of Mind, the ability to distinguish between something done on purpose and something done by accident?
To answer this question, a team of researchers in Germany conducted an experiment that examined how dogs reacted when food rewards were withheld, both intentionally and unintentionally. They found that dogs respond differently depending on whether the actions of the experimenter were intentional or unintentional. This, the researchers say, shows that dogs can distinguish between actions that were done on purpose or accidentally.
To reach their conclusions, the researchers conducted an experiment using the ‘unable vs unwilling’ paradigm. This works by examining whether test subjects react differently towards a human experimenter who intentionally (the unwilling condition) or unintentionally (the unable condition) withholds rewards. Despite being an established paradigm in human and animal cognition studies, the unable vs unwilling paradigm had never been previously used to investigate dogs.
The experiment was conducted with 51 dogs, each of which was tested under three conditions. In each condition, the dog was separated from the human tester by a transparent barrier. The basic situation was that the experimenter fed the dog pieces of dog food through a gap in the barrier. In the ‘unwilling’ condition, the experimenter suddenly withdrew the reward through the gap in the barrier and placed it in front of herself.
In the ‘unable-clumsy’ condition, the experimenter brought the reward to the gap in the barrier and ‘tried’ to pass it through the gap but then ‘accidentally’ dropped it. In the ‘unable-blocked’ condition, the experimenter again tried to reward the dog but was unable to because the gap in the barrier was blocked. In all conditions, the reward remained on the tester’s side of the barrier.
‘If dogs are indeed able to ascribe intention-in-action to humans,’ says Dr Juliane Bräuer, ‘we would expect them to show different reactions in the unwilling condition compared to the two unable conditions. As it turns out, this is exactly what we observed.’
The primary behaviour measured by the researchers was the time dogs waited before approaching the reward they were denied. The researchers predicted that if dogs can identify human intentions, they will wait longer before approaching the reward in the unwilling condition, where they were not supposed to have the reward, than in the two unable conditions in which the reward was, in fact, meant for them.
Not only did the dogs wait longer in the unwilling condition than in the unable conditions, but they were also more likely to sit or lie down – actions often interpreted as appeasing behaviours – and stop wagging their tails. ‘The dogs in our study clearly behaved differently depending on whether the actions of a human experimenter were intentional or unintentional,’ says Britta Schünemann, the first author of the study. ‘This suggests that dogs may indeed be able to identify humans’ intention-in-action,’ adds Hannes Rakoczy from the University of Göttingen.
The team acknowledges that their findings may be met with scepticism and that further study is needed to address alternative explanations, such as behavioural cues on the part of experimenters or knowledge transfer from prior dog training. ‘Nevertheless,’ the paper concludes, ‘the findings present important initial evidence that dogs may have at least one aspect of Theory of Mind: The capacity to recognise intention-in-action.’