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Domestication shaped wolves into dogs and transformed both their behavior and their anatomy. Here we show that, in only 33,000 y, domestication transformed the facial muscle anatomy of dogs specifically for facial communication with humans. Based on dissections of dog and wolf heads, we show that the levator anguli oculi medialis, a muscle responsible for raising the inner eyebrow intensely, is uniformly present in dogs but not in wolves. Behavioral data, collected from dogs and wolves, show that dogs produce the eyebrow movement significantly more often and with higher intensity than wolves do, with highest-intensity movements produced exclusively by dogs. Interestingly, this movement increases paedomorphism and resembles an expression that humans produce when sad, so its production in dogs may trigger a nurturing response in humans. We hypothesize that dogs with expressive eyebrows had a selection advantage and that “puppy dog eyes” are the result of selection based on humans’ preferences.

Only a few dogs in the world are label-learners, with the ability to process and retain a vast number of object referents. Here we present data from a battery of cognitive tests that could explain why they outperform their conspecifics. In a citizen science approach, we instructed dog owners across five different countries, on how to administer a series of eight cognitive tests to their dogs. The group of label-learner dogs ( N  = 11) was then compared to control dogs ( N  = 11) that did not have that label learning ability. Our experiment demonstrates, for the first time, that the label-learner dogs’ ability might be based on measurable individual differences in three specific cognitive domains: their interest in novel objects, their targeted interest in objects and their inhibitory skills. Future research, replicating the results on a larger sample, can explore if the label-learner dogs’ outstanding cognitive skills are already present at the puppy stage or develop over time.

Domestic dogs demonstrate sensitivity to human gaze and attentiveness, but evidence is mixed for their understanding of human knowledge, in the sense of understanding what a person has or has not seen. Here we tested whether pet dogs take a human competitor’s past visual access into account in a 3-choice food competition task. The dogs ( N  = 22) observed food being hidden under 2 of 3 cups, and witnessed how their human competitor saw only one baiting. When the human chose first, dogs were expected to avoid the cup she had seen baited; when dogs chose first, they were expected to choose randomly between baited cups, or favour the cup both had seen baited. However, the dogs chose randomly between the baited cups, regardless of who had first choice. The dogs did choose the cup only they had seen baited above chance only when the competitor chose first, suggesting a potential preference for this cup only in this situation, but they did not choose this cup more than the cup both had seen. Therefore, the current study provides no clear evidence that pet dogs infer others’ knowledge from past visual access. The combination of cognitive steps required to be successful in this task might have been too demanding for the dogs. Alternatively, the competitive setting used may not be as suitable for domestic dogs as it is for other species. Further research in ecologically relevant settings may clarify the extent and limits of dogs’ understanding of others’ knowledge.

Most mammalian species produce facial expressions. Historically, animal facial expressions have been considered inflexible and involuntary displays of emotional states rather than active attempts to communicate with others. In the current study, we aimed to test whether domestic dog facial expressions are subject to audience effects and/ or changes in response to an arousing stimulus (e.g. food) alone. We presented dogs with an experimental situation in which a human demonstrator was either attending to them or turned away, and varied whether she presented food or not. Dogs produced significantly more facial movements when the human was attentive than when she was not. The food, however, as a non-social but arousing stimulus, did not affect the dogs’ behaviour. The current study is therefore evidence that dogs are sensitive to the human’s attentional state when producing facial expressions, suggesting that facial expressions are not just inflexible and involuntary displays of emotional states, but rather potentially active attempts to communicate with others.

Dogs are particularly skilful during communicative interactions with humans. Dogs' abilities to use human communicative cues in cooperative contexts outcompete those of other species, and might be the result of selection pressures during domestication. Dogs also produce signals to direct the attention of humans towards outside entities, a behaviour often referred to as showing behaviour. This showing behaviour in dogs is thought to be something dogs use intentionally and referentially. However, there is currently no evidence that dogs communicate helpfully, i.e. to inform an ignorant human about a target that is of interest to the human but not to the dog. Communicating with a helpful motive is particularly interesting because it might suggest that dogs understand the human's goals and need for information. In study 1, we assessed whether dogs would abandon an object that they find interesting in favour of an object useful for their human partner, a random novel distractor, or an empty container. Results showed that it was mainly self-interest that was driving the dogs' behaviour. The dogs mainly directed their behaviour towards the object they had an interest in, but dogs were more persistent when showing the object relevant to the human, suggesting that to some extent they took the humans interest into account. Another possibility is that dogs' behaviour was driven by an egocentric motivation to interact with novel targets and that the dogs' neophila might have masked their helpful tendencies. Therefore, in study 2 the dogs had initial access to both objects, and were expected to indicate only one (relevant or distractor). The human partner interacted with the dog using vocal communication in half of the trials, and remaining silent in the other half. Dogs from both experimental groups, i.e. indicating the relevant object or indicating the distractor, established joint attention with the human. However, the human's vocal communication and the presence of the object relevant to the human increased the persistency of showing, supporting the hypothesis that the dogs understood the objects' relevance to the human. We propose two non-exclusive explanations. These results might suggest that informative motives could possibly underlie dogs' showing. It is also possible that dogs might have indicated the location of the hidden object because they recognised it as the target of the human's search. This would be consistent with taking into account the objects' relevance, without necessarily implying that the dogs understood the human's state of knowledge.

NGOs utilise a range of programming to bring about desired changes. This study examines the advantages and limitations of the range of approaches used by one particular NGO sector: working equid welfare organisations, from the perspective of NGO staff. NGO staff hold a wealth of knowledge regarding the design and implementation of welfare improvement initiatives; however this knowledge is rarely systematically documented. Through 32 semi-structured interviews the experiences of staff across multiple organisations were explored. The nine most commonly utilised approaches within equid focussed NGO programming were discussed with participants. Many themes resulting from the interviews centred around the strengths and disadvantages of these individual approaches, implemented both historically and presently by different NGOs. The influences of the context in which initiatives took place and barriers to welfare improvement that existed across approaches were also examined. Striking a balance came through as a strong theme at many levels. Balancing top-down versus bottom-up approaches was a frequently voiced concern, as was balancing the utility of certain approaches against associated factors warranting caution. Combinations of approaches that were felt to be complementary provided a balance that drew on the strengths and mitigated for the weaknesses of different approaches. The need to tailor approaches to individual contexts was also raised and is especially relevant to INGOs working across multiple countries, cultures and political structures. The study provides an informed insight into potential factors to consider when designing future welfare initiatives. The collaborative pooling of experience across different NGOs could help make welfare initiatives more effective and provide a framework for NGOs in other fields to learn from each other’s collective knowledge.

We investigated children’s and non-human great apes’ ability to anticipate others’ choices from their evident food preferences—regardless of whether these preferences deviate or align with one’s own. We assessed children from three culturally-diverse societies (Namibia, Germany, and Samoa; N = 71; age range = 5–11) and four non-human great ape species (chimpanzees ( Pan troglodytes ), bonobos ( Pan paniscus ), gorillas ( Gorilla gorilla ), and orangutans ( Pongo abelii ); N = 25; age range = 7–29) regarding their choices in a dyadic food-retrieval task. Across conditions, participants’ preferences were either aligned ( same preference condition) or opposed ( opposite preference condition) to those of their competitors. Children across societies altered their choices based on their competitor’s preferences, indicating a cross-culturally recurrent capacity to anticipate others’ choices relying on preferences-based inferences. In contrast to human children, all non-human great apes chose according to their own preferences but independent of those of their competitors. In sum, these results suggest that the tendency to anticipate others’ choices based on their food preferences is cross-culturally robust and, among the great apes, most likely specific to humans.

How wolves were first domesticated is unknown. One hypothesis suggests that wolves underwent a process of self-domestication by tolerating human presence and taking advantage of scavenging possibilities. The puppy-like physical and behavioural traits seen in dogs are thought to have evolved later, as a byproduct of selection against aggression. Using speed of selection from rehoming shelters as a proxy for artificial selection, we tested whether paedomorphic features give dogs a selective advantage in their current environment. Dogs who exhibited facial expressions that enhance their neonatal appearance were preferentially selected by humans. Thus, early domestication of wolves may have occurred not only as wolf populations became tamer, but also as they exploited human preferences for paedomorphic characteristics. These findings, therefore, add to our understanding of early dog domestication as a complex co-evolutionary process.

During speech acquisition, children form quick and rough hypotheses about the meaning of a new word after only a single exposure-a process dubbed \"fast mapping.\" Here we provide evidence that a border collie, Rico, is able to fast map. Rico knew the labels of over 200 different items. He inferred the names of novel items by exclusion learning and correctly retrieved those items right away as well as 4 weeks after the initial exposure. Fast mapping thus appears to be mediated by general learning and memory mechanisms also found in other animals and not by a language acquisition device that is special to humans.

Domestic dogs are skillful at using the human pointing gesture. In this study we investigated whether dogs take contextual information into account when following pointing gestures, specifically, whether they follow human pointing gestures more readily in the context in which food has been found previously. Also varied was the human's tone of voice as either imperative or informative. Dogs were more sustained in their searching behavior in the 'context' condition as opposed to the 'no context' condition, suggesting that they do not simply follow a pointing gesture blindly but use previously acquired contextual information to inform their interpretation of that pointing gesture. Dogs also showed more sustained searching behavior when there was pointing than when there was not, suggesting that they expect to find a referent when they see a human point. Finally, dogs searched more in high-pitched informative trials as opposed to the low-pitched imperative trials, whereas in the latter dogs seemed more inclined to respond by sitting. These findings suggest that a dog's response to a pointing gesture is flexible and depends on the context as well as the human's tone of voice.