Summary: After roughly 14,000 years of domestication, dogs show stronger social cognition and people-reading abilities than wolves.
Source: Duke University
You’ve seen it: you point and say “go find the ball,” and your dog immediately heads to the right spot.
That seemingly simple skill—understanding human gestures—is actually a sophisticated cognitive ability and is uncommon across animal species. Closely related animals like chimpanzees and wolves generally do not interpret human pointing and gaze the way domestic dogs do, according to a new study led by researchers at Duke University and published in the journal Current Biology.
Domestication over thousands of years appears to have reshaped more than dogs’ appearance; it also altered their social minds. Dogs demonstrate early-emerging “theory of mind” characteristics—basic mental skills that let them infer what humans are thinking or intending in many everyday situations.
The research compared 44 dog puppies and 37 wolf puppies, all between five and eighteen weeks old. The findings support the view that domestication changed canine cognition, not just morphology.
To ensure a fair comparison, wolf puppies at the Wildlife Science Center in Minnesota were genetically screened to exclude wolf–dog hybrids and then hand-raised with intensive human care. They were fed by hand, slept near their caretakers, and received nearly continuous human attention from days after birth. The dog puppies, provided by Canine Companions for Independence, lived with their mothers and littermates and experienced less direct human interaction during early life.
In one key experiment, researchers hid a treat under one of two bowls and gave each puppy a cue to indicate where the food was hidden. In some trials the experimenter pointed and looked toward the correct bowl; in others a small wooden block was placed beside the correct bowl—a novel, unfamiliar gesture for all puppies.
The differences were clear and compelling. Dog puppies as young as eight weeks old reliably used those human cues and were about twice as likely to find the treat as wolf puppies of the same age, even though the wolves had been exposed to more human caretaking. Seventeen of 31 dog puppies consistently chose the correct bowl, while none of the 26 hand-reared wolf pups performed above chance. Control trials confirmed the puppies were not merely smelling out the treat.
Many dog puppies succeeded on their very first trial—without any prior training—demonstrating an innate sensitivity to human communicative signals. This early emergence suggests these skills are part of dogs’ inherited social toolkit.
The study’s first author, Hannah Salomons, a doctoral student in Brian Hare’s lab at Duke, emphasized that the results do not mean one species is generally smarter than the other. Dog and wolf puppies performed similarly on non-social tasks such as memory tests and motor self-control tasks that required detouring around transparent barriers to reach food.
It was specifically the social, people-reading abilities where dogs outperformed wolves.
“There are many kinds of intelligence,” Salomons said. “Animals evolve cognitive abilities suited to the environments they inhabit.”
Other experiments in the study showed dog puppies were far more likely to approach and engage with unfamiliar people—about thirty times more likely—while most wolf puppies tended to avoid strangers, often retreating to a corner.
When food was placed inside a sealed container that could not be opened, wolf pups generally attempted to solve the problem themselves. In contrast, dog puppies more frequently looked to humans for help and made eye contact in a clear attempt to solicit assistance.
Senior author Brian Hare, professor of evolutionary anthropology at Duke, says these results provide strong support for the “domestication hypothesis”: that selection for reduced fear and increased social attraction to humans gradually favored individuals better able to read human gestures and cooperate with people.
Somewhere between roughly 12,000 and 40,000 years ago, dogs and wolves diverged from a common ancestor. One plausible path for domestication is that friendlier, less fearful wolves obtained consistent access to human scraps, while shyer wolves stayed away and had fewer resources. Over generations, selection for reduced fear and increased tolerance would have promoted traits that made early dogs more attuned to human social cues.
“This study strengthens the evidence that dogs’ social sensitivity—what some call their social genius—is a direct outcome of domestication,” Hare said. That sensitivity underlies the effectiveness of dogs as service animals: many of these cooperative behaviors are present from an early age.
Like human infants, dog puppies intuitively grasp that a pointing gesture indicates communicative intent; wolf puppies do not display this same understanding. Researchers interpret this as an indication that domestic dogs are predisposed to assume humans are cooperative partners.
“Dogs are born with a readiness to understand that people are communicating and will cooperate with them,” Salomons said.
Funding: This research was supported by the Office of Naval Research (N00014-16-12682), the Eunice Kennedy Shriver National Institute of Child Health and Human Development of the National Institutes of Health (NIH-1Ro1HD097732), and the AKC Canine Health Foundation (#2700).
About this animal psychology research news
Source: Duke University
Contact: Robin Ann Smith, Duke University
Image: The image is in the public domain
Original Research: Open access. “Cooperative Communication with Humans Evolved to Emerge Early in Domestic Dogs” by Hannah Salomons et al., published in Current Biology. DOI: 10.1016/j.cub.2021.06.051
Abstract
Cooperative Communication with Humans Evolved to Emerge Early in Domestic Dogs
Highlights
- •Dog puppies show greater attraction to humans than wolf puppies raised by people
- •Dog puppies read human gestures and make eye contact more readily than wolf puppies
- •Both species perform similarly on memory and inhibitory control tasks
- •Dogs’ early social skills point to domestication’s effect on cognitive development
Summary
Although dogs evolved from wolves, the cognitive consequences of domestication are still being explored. One leading idea proposes that domestication selected for an increased attraction to humans, which in turn altered social development and made dogs more flexible in using inherited skills for cooperative communication with people.
To test this, researchers compared 44 dog puppies and 37 wolf puppies, aged 5–18 weeks, across a suite of temperament and cognition tasks. The study found that dog puppies are more drawn to humans, better at reading human gestures, and more likely to make eye contact with people than wolf puppies. Both species showed similar interest in familiar objects and matched performance on non-social measures such as memory and inhibitory control.
These findings are consistent with the idea that domestication sharpened dogs’ cooperative-communicative skills by selecting for social attraction to humans and reshaping early social maturation.