Abstract
Yawning is a simple, evolutionarily conserved behavior with physiological and social functions. In both humans and dogs, yawns can be contagious, reflecting motor and social resonance rather than necessarily empathic processes. Evidence indicates that dogs are more likely to yawn in response to familiar humans, particularly their owners, and that such yawning serves a pacifying and communicative function. Contagious yawning in dogs appears to facilitate social attunement, reduce tension, and signal peaceful intent. This paper reviews current research on canine yawning, its neural and behavioral underpinnings, and its role in interspecific communication, highlighting the ways dogs use yawning and related behaviors to maintain harmonious interactions with humans.
Your dog understands your yawn
A yawn is a simple behavior, a reflex with specific physiological functions. We are not the only ones yawning. Chimpanzees, bonobos, macaques, and dogs, among others, yawn (Guggisberg, Mathis, Schnider, & Hess, 2010; Joly-Mascheroni, Senju, & Shepherd, 2008; Ake & Kutsukake, 2023). Although a simple behavior, yawning also performs social functions. It is contagious not only within groups of individuals of the same species but also across species, including between humans and dogs (Joly-Mascheroni et al., 2008; Romero, Konno, & Hasegawa, 2013; Norscia & Palagi, 2011).
Because yawning is both widespread and multifunctional, several explanations have been proposed for its original biological role. One classic hypothesis suggests that yawning increases the influx of oxygen into the blood when carbon dioxide levels rise; however, this explanation is now widely considered unsupported (Guggisberg et al., 2010). Another hypothesis proposes that yawning stretches the muscles of the tongue and neck (Provine, 2012). A further interpretation emphasizes the need to maintain alertness, a crucial condition for predators (Provine, 2012). Given that social predators depend on one another, yawning may have evolved to be contagious through natural selection because of the cooperative advantages it confers. Additionally, yawning may help regulate brain temperature (Gallup & Gallup, 2007; Gallup & Eldakar, 2013; Gallup, 2022).
Pharmacological and neurochemical research shows that yawning is regulated by a network of neurotransmitters. Dopamine (via D₂/D₃ receptors) and serotonin both modulate yawning, and oxytocin may also play a role (Wani & Agarwal, 2025; Argiolas & Melis, 1998). These interactions suggest that yawning reflects changes in arousal, social state, and internal regulation—consistent with its role as a pacifying or self-soothing behaviour.
A widely proposed explanation for contagious yawning is that mirror-neuron systems in the frontal cortex of various vertebrates, including humans and dogs, activate corresponding motor representations in others. Neuroimaging studies in humans support this interpretation (Platek, Mohamed, & Gallup, 2005; Schürmann et al., 2005). Further neural evidence indicates that the ventromedial prefrontal cortex—a region associated with social processing—is also involved in contagious yawning, reinforcing the notion that the phenomenon is both motor-resonant and socially relevant (Nahab, Hattori, Saad, & Hallett, 2009).
Studies have found that dogs are more prone to yawn when their owners yawn than when strangers do (Romero et al., 2013; Silva, Bessa, & de Sousa, 2012). In the Tokyo study, researchers monitored the dogs’ heart rate and found no significant change across conditions, suggesting that the yawns were not merely a stress response (Romero et al., 2013). In one auditory-yawn study from Porto University, dogs yawned more to familiar than unfamiliar human yawns, and their stress-related behavior did not differ by condition—indicating that increased yawning was not simply a stress response (Silva et al., 2012). Meanwhile, an experiment at Birkbeck College (University of London) demonstrated that live human yawning triggers yawning in many dogs (Joly-Mascheroni et al., 2008).
Taken together, current behavioral evidence in dogs suggests that a form of interspecific resonance exists: dogs and humans can synchronize their actions during shared activities, and such coordination may emerge from motor-resonance mechanisms analogous to mirror-neuron systems (Lamontagne & Gaunet, 2024). Developmental evidence shows that contagious yawning in puppies emerges gradually, suggesting a maturational component to this resonance (Madsen & Persson, 2013). Mirror neurons may thus provide a neural basis not only for imitation but also for allelomimetic behavior.
However, whether contagious yawning reflects empathy remains debated. One recent Bayesian re-analysis of canine studies concluded that although contagious yawning is present in dogs, it does not display the familiarity, gender, or prosociality biases that an empathy model predicts (Neilands, Claessens, & Ren, 2020). Comparative research likewise cautions that contagious yawning cannot be taken as direct evidence of empathic capacity without more stringent criteria (Massen & Gallup, 2017).
Wolf yawning, a behavior shared by wolves and dogs and also common in other species (photo by Monty Sloan, Wolf Park, Indiana, USA).
The dog’s yawn is much like ours. It often precedes the same characteristic sound. While we commonly associate yawning with tiredness or boredom, it can also express embarrassment, insecurity, excitement, and relief. Some people even yawn when they’re in love—which, if misinterpreted, might be embarrassing.
Dogs may yawn when tired, but yawning usually serves a pacifying function, both for themselves and for others. As with many behaviors, what may have started as one function can evolve into others. Over time, yawning appears to have become a signal of peaceful intentions. For example, a male dog may yawn when a female snarls during courtship, signaling deference rather than aggression; or a confident dog may yawn at an insecure opponent to reassure it.
Dogs yawn at us with the same functions and results. They may also yawn as a displacement activity. An owner scolding his dog is a typical situation in which we see a dog yawn. In critical training cases prone to error, such as the so-called ‘stay,’ the owner’s behavior often causes the dog to feel insecure. A yawn is likely to follow, together with licking and muzzle-nudging. As soon as the owner changes behavior, say, by using a friendlier tone or more relaxed body posture, the dog ceases to display those pacifying behaviors.
Conclusion
Yawning is a ubiquitous behavior with ancient biological roots. While its original function remains debated, evidence supports multiple physiological and social roles—including thermoregulation, alertness maintenance, and behavioral synchronization. In dogs, as in humans, contagious yawning reflects a form of motor and social resonance, though not necessarily empathy in the strict scientific sense. Research consistently shows that dogs are more likely to yawn in response to familiar humans, particularly their owners, and such responses are not simply manifestations of stress. Rather, they appear to facilitate social attunement, reduce tension, and communicate peaceful intent.
Thus, when your dog yawns at you, it is unlikely to be random. It most likely expresses comfort and trust, and it invites the maintenance of social harmony. Your dog yawns at you to show it is friendly and peaceful—and you may safely yawn back, confirming the same. Yawning, along with champing (chomping), lip-licking, eye-squeezing, a pouty mouth, and the canine muzzle-grasp—all common elements of intraspecific canine social interaction—functions equally effectively in interspecific communication.
Featured Picture: Human and dog yawning (composition by Roger Abrantes).
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