This month in canine science – July 2026

Every month I go through what’s been published in canine science – looking for studies that might shift how we understand our dogs. Not every month delivers something dramatic. July was one of those months where the findings were quietly significant rather than flashy, let’s dive in.

Can your dog’s walk reveal what’s happening in their brain?

Picture your dog walking across the room. Those few steps might be carrying more information than they look like.

Researchers from North Carolina State University, working with a cohort of 88 senior and geriatric dogs enrolled in the Longitudinal Study of Canine Neuroaging, looked at whether stride length in older dogs was connected to cognitive impairment. Specifically front limb stride length, adjusted for body size.

The finding: dogs showing higher scores on a validated cognitive impairment scale – the Canine Dementia Scale – tended to have shorter front limb stride lengths. And this relationship held even after accounting for age and pain. That last part matters, because it means the gait change wasn’t just explained by arthritis or general aging. It seemed to reflect something specific to cognitive status.

Right now, canine cognitive dysfunction is identified largely through what owners notice at home – getting lost in familiar spaces, altered sleep, staring into nothing, changes in social interaction. Those signs are real and important. But they’re also subjective, and they often show up once the condition is already progressing.

If future research builds on this, something as low-tech as a short standardised walk on a measured path could become a useful additional tool for detecting cognitive decline – perhaps earlier than behavioural changes make it obvious on their own.

Sources:

Rafatpanah Baigi et al., Frontiers in Veterinary Science, 2026

Does motherhood make dogs age faster?

The intuition going in is that reproduction is costly. Energy diverted to pregnancy and raising pups should leave less for the body’s own maintenance – and that should show up eventually as faster aging.

That’s the theory. The data in this study told a different story.

Researchers from Purdue University used the Exceptional Aging in Rottweilers Study cohort – 95 female Rottweilers that had all reached exceptional longevity of 13 years or more. They compared females that had produced litters with those that hadn’t, measuring frailty using a validated 34-item clinical frailty index covering everything from mobility and cognition to pain and continence.

The finding were surprising to me: females that had given birth were three times more likely to remain robust in late life than those that hadn’t. And the more litters, the stronger the effect – females with two or more litters were over seven times more likely to retain late-life robustness.

Before drawing any conclusions, it’s worth sitting with the caveats. This is a specific breed. The cohort, by design, consists only of dogs that already reached exceptional longevity – which means dogs that aged poorly may never have entered the picture. The researchers were careful about this and did extensive work to check whether healthier females were simply more likely to have bred in the first place. The signal held even after those checks.

What might explain it? The researchers point toward epigenetic reprogramming – the idea that pregnancy leaves lasting biological changes that may actually support long-term health. It’s a hypothesis that mirrors some findings in human research, where several studies have found lower frailty in women who had children compared to those who hadn’t.

This doesn’t mean breeding your dog is good for their health. The study can’t tell us that. What it does suggest is that the relationship between reproduction and aging is considerably more complicated than the simple “reproduction costs longevity” story that evolutionary theory predicts.

Sources:

Waters DJ, Maras AH, Fu R, Carrillo AE, Chiang EC, Suckow CL. The relationship between parity and late-life frailty: companion dogs as a preclinical model for evaluating factors that aggravate or mitigate the frailty cost of reproduction. J Gerontol A Biol Sci Med Sci. 2026 Jul 1;81(8):glag163. doi: 10.1093/gerona/glag163. PMID: 42477997; PMCID: PMC13384962.

What these two studies have in common

For a long time, canine cognition research was largely focused on demonstrating what dogs can do: recognising words, following pointing gestures, solving problems. Those questions still matter.

But increasingly, researchers are asking something different: how do dogs age? Which biological markers predict it? How do life events, including reproduction, early-life health, activity levels – shape the trajectory?

Canine aging research is becoming more about understanding what determines whether they stay healthy for longer. And in doing that, dogs are becoming useful models for understanding human aging too.