Do Dogs Have a Favorite Person? The Oxytocin Science Behind Canine Bonding

Published August 2026 · Pet N Pet Editorial · National Dog Day Science Series

Yes, and it's not favoritism in the way that sounds. In 2015, researchers at Azabu University in Japan found that when a dog gazes at its owner, both of their bodies release oxytocin, the same hormone tied to bonding between parents and infants (Nagasawa et al., Science, April 2015). The longer the gaze, the bigger the hormone rise, on both ends.

That gaze-oxytocin loop is the closest thing science has to an explanation for why a dog seems to light up for one particular person. It isn't about who hands out the most treats. It's a feedback loop, and it runs specifically between a dog and whoever is on the other end of that stare.

The 2015 Study That Found the Bonding Loop

Researchers Miho Nagasawa and Takefumi Kikusui had 30 dog-owner pairs interact freely for 30 minutes, then measured oxytocin in the owners' urine. Owners whose dogs gazed at them the longest, 21 of the 30 dogs, showed a significant rise in oxytocin after the interaction. Owners of the 9 short-gaze dogs showed no such change (Nagasawa et al., Science, April 2015).

The team then tested it the other way. They gave 27 dogs a dose of oxytocin, or a saline placebo, up the nose, and the female dogs who received the real hormone gazed at their owners longer, which in turn raised the owners' oxytocin too, even though the owners hadn't received any hormone themselves. Gaze in, oxytocin out, on both ends of the leash.

This Might Be a Dog-Specific Trait, Not Just a Socialization Thing

The same 2015 study tested hand-raised wolves against the dogs, and the wolves didn't show the gaze-oxytocin loop at all, despite plenty of exposure to their human caregivers. That's a meaningful clue that this bonding mechanism may have developed specifically during dog domestication rather than through simple exposure to people.

That said, this is genuinely contested. A 2023 commentary in PNAS pushed back on broader claims that wolves show comparable attachment to dogs, arguing some of those follow-up studies used inconsistent test protocols (Gácsi, Miklósi, and Topál, 2023). What's well established is that dogs show the loop reliably. Whether it's truly unique to dogs is still being argued out in the literature.

Your Dog's Brain Responds to Your Scent, Specifically

Neuroscientist Gregory Berns trained 12 dogs to lie still, awake, inside an MRI scanner, then exposed them to five scents: a familiar person, a familiar dog, an unfamiliar person, an unfamiliar dog, and the dog's own scent. The caudate nucleus, a brain region tied to reward, activated most strongly for the familiar person's scent, more than for any of the other four, including the dog's own smell (Berns et al., Behavioural Processes, 2015).

That's a striking result. Of everything tested, including itself, a dog's brain treats the scent of its person as the single biggest reward signal in the room.

So What Actually Decides Who the Favorite Is?

Research on dog attachment styles, modeled directly on the classic attachment tests used with human infants, points to a consistent pattern: dogs form the strongest bond with whoever provides the most consistent, responsive care, not necessarily whoever spends the most raw hours in the house (Payne, Bennett, and McGreevy, and related attachment-style research).

Gaze duration matters specifically because it's the trigger for the oxytocin loop above, and it isn't universal across every dog the same way. A 2017 follow-up study found ancient Japanese breeds like the Shiba Inu bond almost entirely through eye contact, seeking physical touch for only about five seconds on average, while other breeds rely far more on physical contact to bond (Nagasawa et al., Frontiers in Psychology, 2017). A dog's "favorite person" cues can look completely different from one dog to the next.

Is It a Fixed Ranking, or Does It Change?

A 2026 study out of Duke University's Canine Cognition Center tested 31 dogs from multi-dog households and found their preference for a person over another household dog depended heavily on context, not a locked-in hierarchy. A dog might sit near its favorite person in one moment and choose something else entirely in the next, depending on what's competing for its attention (Duke Canine Cognition Center, Animal Cognition, 2026).

In other words, "favorite person" isn't a permanent title stamped on one household member. It's closer to a running tally, shaped by who's offering responsive care and consistent eye contact right now, not a decision your dog made once and never revisited.

Frequently Asked Questions

Why does my dog only listen to one person in the house?

It's likely tied to which person provides the most consistent, responsive care and the most sustained eye contact, the two factors most linked to the oxytocin bonding loop identified in 2015 research from Azabu University. It's a real biological pattern, not just a personality quirk.

Do dogs really release the same bonding hormone as humans?

Yes. Oxytocin, the hormone tied to bonding between parents and infants, rises in both dogs and their owners after sustained eye contact, according to a 2015 study published in Science. It's the same hormone, working through a similar mechanism.

Can a dog have more than one favorite person?

Research suggests it's less about a fixed favorite and more about context. A 2026 Duke University study found dogs' preferences among household members shift depending on the situation rather than locking onto one person permanently.

Do wolves bond with humans the same way dogs do?

In the original 2015 study, hand-raised wolves did not show the same gaze-triggered oxytocin loop that dogs did, despite similar human exposure. This finding is actively debated in the research community, with a 2023 commentary challenging how directly comparable the underlying test conditions really were.

Does my dog's breed affect how it bonds with me?

It can. A 2017 follow-up study found that ancient Japanese breeds like the Shiba Inu rely almost entirely on eye contact to bond, seeking physical touch for only a few seconds at a time, while other breeds depend far more on physical closeness.

Bottom Line

There's a real biological loop behind why your dog seems to have a favorite. Eye contact triggers oxytocin in both of you, your dog's brain treats your specific scent as its biggest reward, and the whole thing runs on consistent, responsive care more than raw time spent in the room. It's also not permanent. The same science that explains the bond also suggests it's built and rebuilt every day, one gaze at a time.

SOURCES & CITATIONS

Nagasawa, Mitsui, En et al.  "Oxytocin-gaze positive loop and the coevolution of human-dog bonds," Science 348(6232):333-336  the core 2015 study.  https://www.science.org/doi/10.1126/science.1261022

Nagasawa, Ogawa, Mogi, Kikusui  Breed follow-up study on gaze vs. touch bonding channels, Frontiers in Psychology (Sept 2017).  https://www.frontiersin.org/journals/psychology/articles/10.3389/fpsyg.2017.01624/full

Berns, Brooks, Spivak  fMRI study on caudate-nucleus response to familiar-human scent, Behavioural Processes 110:37-46 (Jan 2015).  https://www.wellbeingintlstudiesrepository.org/soccog/17/

Gácsi, Miklósi, Topál  Commentary challenging wolf-comparable-attachment claims, PNAS (Sept 19, 2023)  cited as the counter-perspective on dog-uniqueness.  https://pmc.ncbi.nlm.nih.gov/articles/PMC10509145/

Duke Canine Cognition Center  Context-dependent household proximity-preference study, Animal Cognition (published April 2026).  https://link.springer.com/article/10.1007/s10071-026-02060-6

Payne, Bennett, McGreevy  Dog attachment-style research adapting the human infant Strange Situation Test framework.  https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4338184/