Dogs are sensitive to their owners' choice even though they prefer to fetch their favorite toy when it is in reach, suggests a new study.
Researchers at the Eötvös Loránd University (ELTE ) investigated whether dogs' behaviours are guided by human displays of preference or by the animals' own choices.
They found that dogs' looking times, but not fetching behaviour, were influenced by the owner's expression of preference. Although the studies did not demonstrate that dogs override their own preferences for an object, the results suggested that the owners' expressed preference was perceived by the dogs and guided their perceptual focus.
Studies on animal cognition deepen our understanding of the human mind's evolution and help inform policy makers in the production of legislation around animal keeping. Whether dogs have any idea that their humans have thoughts and emotions of their own, is one of the hot topics in dog research.
One of these goals has been to investigate how dogs respond to expressions signaling the preferences of humans.
The new study published in Frontiers in Psychology follows up on previous efforts in this direction.
“18-month-old children recognise that their own preference might differ from that of others and they understand how desire can be inferred from emotional expressions, but 14-month-olds do not. We wanted to test where dogs are on this scale,” said Eniko Kubinyi, leading author of the study, senior researcher at Eötvös Loránd University.
The researchers first tested a subset of dogs on their spontaneous preference for either a dog toy or a bracelet. The toy was without exception the more desirable object. Next, owners displayed happy expressions towards the bracelet and made disgusted faces towards the toy. Then the owner asked the dog to fetch, without providing additional guiding cues. All dogs fetched the toy, indicating that their own choice was not overcome by the emotional expressions of the owner. "Thus dogs either are not able to distinguish between their own and the owners' preference or they failed to inhibit the "wrong" response" explained Flóra Szánthó, co-author.
The researchers decided to dig deeper. “Fetching was clearly not a good choice to measure dogs' sensitivity to others' preferences for several reasons" noted Kubinyi.
“Since their own favourite object was in reach, the dogs had little incentive to factor in the owner's choice in their responses. We assumed that if the same objects were out of reach, they would stimulate what appears to be "showing" behavior in the dogs and they would direct more attention towards their owners' pick, thereby also weakening the affordance provided by their preferred object."
To test this hypothesis, the researchers decided to put the objects up on the laboratory's windowsill where the dogs could not reach them.
Fifty-one dogs were assigned to one of two experimental groups: a matching/congruent condition where owners displayed happy expressions towards the toy and made disgusted faces towards the bracelet, and a non-matching/incongruent condition, where owners showed happiness toward the bracelet and disgust toward the toy. After the emotion display, the toy and the bracelet were placed out of reach and the researchers now measured how much time the dogs looked at each object.
"In this case", said Ivaylo Iotchev, postdoc at Eötvös Loránd University, and co-author, "the dogs looked at the favoured toy when their owner had previously responded to it with a happy face. In the other group they looked the same amount of time at the bracelet and the toy."
The demonstration of the owners' preference affected the dogs' behavior. “It is not certain that this influence is the result of inferred and shared representations," said Kubinyi.
"We have not found conclusive evidence that dogs, similarly to one and a half.year-old toddlers, understand the subjectivity of the desire—different people can have different attitudes toward the same object.
“If they indeed infer the owner's preference, they might not understand fetching as an act of offering an object to a human, or response inhibition, an important aspect of cognitive control, was not sufficiently strong to overwrite the animals' own preference," Kubinyi said.