Dogs also share their food, albeit mainly with four-legged friends rather than strangers. A new study has now confirmed this prosocial behavior among canines. The more complex methodology of the study, however, showed that the experimental set-up has an impact on the dogs’ behavior and that even the mere presence of another dog makes the animals more generous.
Generosity, even among family members, had long been under consideration to be a specifically human characteristic. Yet rats, chimpanzees, and other animals also exhibit similar behavior. Rachel Dale, Friederike Range and colleagues, of the Messerli Research Institute at Vetmeduni Vienna, had already shown that dogs also share food rewards with other dogs. Using a bar pulling task, the dogs delivered the treats to partner dogs — especially if they already knew these. A new study by the research team now used a more complex task set-up. This is to confirm the prosocial behavior of dogs. The experiment showed that dogs continued to prefer familiar partners. However, the increased complexity of the task influenced the readiness with which the dogs delivered a food reward to another animal. The study thus confirmed that the chosen method affects the result. Moreover, this is much more dependent on social proximity than the previous assume.
Recognition of objects necessary for giving treats
Instead of pulling on a rope, the dogs in the present study had to recognize special objects in the form of tokens in order to deliver a food reward to the other dog.”This time we not only tested a different experimental set-up but also the level of difficulty,” explains Dale. “The first training for dogs was to touch a token in exchange for a food reward for themselves. They were then trained to recognize two more tokens: one that resulted in a reward being delivered to a partner dog and another which did not.” Three experiments were then conducted to test whether the dogs exhibited prosocial behavior even in this more complex task and whether they would deliver a food reward to a partner or not. The researchers also tested whether it made a difference to the donor dog if the receiver was familiar or a stranger and whether the presence of another dog was enough to trigger generous behavior in the test dog even if the partner had no access to the food.
Do dogs have to see the recipients to reward them?
The test set-up consisted of two enclosures. The test dog was under training to wait at a specific location in one enclosure until the researchers revealed a board containing the tokens. The dog could then choose to deliver a food reward to the receiver dog or not.In the first test, either a familiar dog or a stranger sat in the receiver enclosure. The dogs could see each other during the experiment. In the second test, the receiver enclosure remained empty but the other dog was present in the testing room. In a third test, the test dogs were alone in the entire set-up. At the end of each test series, the donor animals could reward themselves by being allowed to touch the token that delivered the food reward to them. This was to ensure that the dogs remained motivated and unstressed and did not become distracted by an unfamiliar dog.
Dogs remain charitable even in complex tasks
The experiment confirmed that dogs continue to exhibit prosocial behavior despite the more complex task. The dogs clearly showed a preference for sharing the food reward with a familiar dog. Unfamiliar they rewarded dogs nearly three times less often than familiar ones. The higher level of complexity, however, impacted the general frequency of the food delivery. This influence could be shown among dogs for the first time by comparing the token choice experiment with the simpler bar-pulling set-up and confirms the results of similar tests performed with small children and chimpanzees.
Presence of a partner makes dogs more likely to share
The behavioral biologists found another significant difference regarding the question whether the presence of a partner was important for the motivation of the test dog. Even when a second dog was in the testing room at that moment without being in the other enclosure, the donor dogs were more motivated to give a food reward. When the test dogs were alone in the room, the number of food deliveries went down.We could not show this aspect in the first study. The social facilitation theory starts from the assumption that animals will perform more readily in the presence of conspecifics. Given a more complex task, the presence of a partner appears to play a greater role. In this case, too, the donor dogs preferred familiar partners. “The difference was smaller, however, than when there was direct visual contact. Social facilitation should, therefore, be in consideration and control more strongly in future studies and in simple experiments,” says Range.
Materials provided by University of Veterinary Medicine – Vienna. Note: Content may be edited for style and length.