When your cat curls up next to you on the couch, you feel better. It’s not just an impression. A new study from Kyoto University suggests that cats and their owners share something measurable: a hormonal connection that moves in step with their moods.
In short
- The finding: levels of oxytocin, the “bonding hormone,” rise and fall together in cats and their owners.
- The surprise: the cat’s oxytocin was linked to lower stress and fewer negative feelings in its owner.
- What matters: physical closeness, not how many years you’ve had your cat.
- The limit: a small study that shows a link, not a cause.
What the researchers did
The team, led by Saho Takagi at Kyoto University, followed 29 cats and their 19 owners in their daily lives for a month. The study, published in the journal iScience, combined several measurements:
- Hormones: urine samples from cats and owners, analyzed for oxytocin and cortisol, the stress hormone.
- Closeness: small Bluetooth beacons on the cats’ collars measured how much time they spent physically close to their owners.
- Mood: owners filled in questionnaires about their feelings.
- Behavior: researchers observed how the cats behaved with their owners and with strangers.
Why oxytocin? It’s often called the “bonding hormone.” In humans and many mammals, it rises during affectionate contact and is associated with trust and lower stress. Earlier research had already found oxytocin changes in dogs and their owners during interaction. Cats had been studied far less.
What they found
According to Kyoto University, oxytocin levels in cats and their owners were positively correlated: when one was higher, so was the other. Even more striking, higher oxytocin in the cat was linked to lower cortisol and fewer negative feelings in the owner. The cat’s hormone levels were more closely tied to the owner’s bad mood than the owner’s own oxytocin was.
And one more detail will please cat lovers: owners’ good mood didn’t depend on how long they had had their cat. It depended on how much time they actually spent close to it.
What it means for you
Cats are often described as independent and aloof. This study adds to growing evidence that they form real bonds with their people, bonds that show up in their bodies as well as their behavior. In practice, it’s one more reason to make room for quiet time together: a lap, a sunny spot on the couch, a calm evening routine.
But closeness works on the cat’s terms. A cat that is forced into contact doesn’t feel safe, as we explained with who a cat chooses as its favorite person.
The limit
This is a small study: 19 owners and 29 cats. It shows an association, not proof that the cat directly improves its owner’s mood, or the reverse. As the researchers note, causation remains unclear. Further, larger studies will be needed.
The bond also explains why absence matters: here’s how long a cat can really stay alone, and how long it takes a cat to forget a person.
A cat on your lap, a little more oxytocin on both sides. That’s the science.
