Why does one golden retriever trot happily into any room while another flinches at the doorbell or freezes around unfamiliar dogs? A new genetics study suggests part of the answer is written in DNA, and some of that biological story overlaps with our own.
Researchers led by the University of Cambridge analyzed behavior surveys and genetic data from golden retrievers enrolled in the Golden Retriever Lifetime Study. The work, published in November 2025, links specific canine DNA regions to behavior traits and connects many of those same genes to human mental health and cognition in earlier human genetics research.
How the study measured dog personality
The team used data from the Morris Animal Foundation’s Golden Retriever Lifetime Study, a long running project tracking more than 3,000 pet golden retrievers in the United States since 2012. The project collects health, environmental, lifestyle, and behavior data each year with help from owners and veterinarians.
Owners also reported 73 everyday behaviors using the C-BARQ questionnaire, which rolls responses into 14 broader behavior traits. Researchers then compared those scores with each dog’s genetic markers using genome wide association studies, a standard approach for spotting DNA variants linked to complex traits.
What the genome scan revealed
After genetic quality checks, the analysis included about a thousand dogs, drawn from a larger pool of roughly 1,343 adult golden retrievers ages three to seven. Across the traits, the study found 12 genome wide significant genetic loci tied to eight behaviors, plus nine more loci that met a “suggestive” threshold.
The linked traits included dog directed aggression, dog directed fear, stranger directed fear, touch sensitivity, separation related problems, and trainability. The study also flagged “non social fear,” which can look like a dog panicking at buses, garbage trucks, or that vacuum cleaner you swear was not even that loud.
The human link in 12 genes
When the team compared their canine results with human genetics databases, the overlap was hard to miss. “The findings are really striking” said Cambridge researcher Dr. Eleanor Raffan, pointing to shared genetic roots that can influence emotional states in both species.
Of 18 candidate genes located near the strongest and suggestive loci, 12 have also been associated with at least one human psychiatric, temperamental, or cognitive trait. That includes PTPN1 near the dog directed aggression locus, which has been linked in humans to measures such as educational attainment, cognitive performance, and major depressive disorder.
Another is ROMO1, which fell within a locus tied to trainability in dogs and has been linked in humans to intelligence and emotional sensitivity. The overlap does not mean a single gene causes a specific emotion, but it suggests some shared pathways shaping temperament and stress responses.
Genes are not destiny for dogs or people
The researchers emphasized that genes influence behavior rather than locking it in place. “These results show that genetics govern behavior, making some dogs predisposed to finding the world stressful,” said first author Enoch Alex.
That nuance matters because it reframes what owners often call “bad behavior.” “If your golden retriever cowers behind the sofa every time the doorbell rings, perhaps you might have a bit more empathy,” said Cambridge researcher Anna Morros Nuevo.
Shared environment, shared stress
Dogs do not experience genetics in a vacuum, and neither do we. “Dogs in our home share not only our physical environment, but may also share some of the psychological challenges associated with modern living,” said Daniel Mills of the University of Lincoln.
Noise is a simple example of how the outside world meets biology. Research suggests noise sensitivity can be common in dogs, and even everyday household sounds like vacuums can trigger stress related behaviors in some pets.
Air quality is another shared exposure that rarely gets framed as a pet issue, even though pets breathe the same indoor and outdoor air. Studies have found poor indoor air quality can worsen airway disease in pets, and other research has linked higher fine particle pollution with increases in veterinary visits for dogs and cats.
What owners can take away
For owners, the lesson is not to label a dog as “difficult” and move on. It is to ask what the dog is reacting to, and whether fear or overstimulation is driving the behavior, then work with trainers or veterinarians who take behavior as a health issue.
For science, the bigger promise is that dogs can help researchers study how genes and everyday exposures interact in the real world, which fits the One Health view that human health is connected to animal health and the shared environment.
The study was published on Proceedings of the National Academy of Sciences.
