Shorter front-limb stride length flags cognitive decline in aging dogs

Cognitive decline in aging dogs shows up in how they walk—specifically, in a shortening of the stride in their front limbs, according to a new longitudinal study out of North Carolina State University.¹ The finding gives clinicians a potential objective, low-tech marker to fold into the geriatric workup, complementing the owner questionnaires that currently do much of the heavy lifting in canine cognitive assessment.

The relationship between gait and cognition is well established in human medicine, where shorter stride length and altered spatial gait parameters track with cognitive impairment, fall risk, and progression of Alzheimer-type dementia.¹ It had not been examined in dogs.

"We know that in humans, changes in stride length have been linked to cognitive impairment and dementia," said Natasha J. Olby, Vet MB, PhD, MRCVS, DACVIM (Neurology), professor of neurology and the Dr. Kady M. Gjessing and Rhanna M. Davidson Distinguished Chair in Gerontology at NC State's College of Veterinary Medicine and corresponding author on the study.² "That relationship hasn't been investigated in dogs, so we created this study to examine the problem."

How the study worked

The team drew on the Longitudinal Study of Canine Neuroaging, a prospective cohort of client-owned senior and geriatric dogs at NC State.¹ Eighty-eight dogs were enrolled, with a mean age of roughly 12 to 13 years, spanning mixed and purebred dogs across a wide range of body sizes.¹ Dogs were evaluated approximately every six months, with each visit including physical, neurologic, and orthopedic examinations, mobility assessments, hearing testing, and laboratory work.²

Gait was recorded on a standardized 5-meter indoor walkway, with dogs walked on a loose leash and allowed to set their own pace.¹ Two trained observers reviewed the video to count steps for each limb, and stride length was normalized to withers height to strip out the effect of body size—a step that proved important, since unadjusted stride length was heavily driven by body weight.¹ Owners completed the Canine Dementia Scale (CADES) to gauge cognitive status and the Canine Brief Pain Inventory (CBPI) to capture osteoarthritis-related pain, allowing the researchers to separate cognitive effects from musculoskeletal ones.¹

Front limbs, not back limbs

Height-adjusted thoracic limb stride length declined significantly with age, while pelvic limb stride showed no consistent age-related pattern.¹ More notably, higher CADES scores—signaling more severe cognitive decline—were associated with shorter thoracic limb stride, and that association held after adjusting for both age and owner-reported pain.¹ In the multivariable model, age alone was not a significant predictor once cognitive status was accounted for, suggesting stride length reflects something about neurologic aging that chronological age does not fully capture.¹

The effect size was small: a 10-point increase in CADES corresponded to roughly a 1.2% reduction in thoracic limb stride length.¹ The front-versus-back split is what the authors found most telling. "While thoracic limbs play a key role in braking and postural stabilization, pelvic limbs mainly act as a propulsion motor," Olby said.² "Thoracic limb movement is likely under more cortical influence than pelvic limbs and may be more sensitive to alterations in visual or spatial awareness than pelvic limb movement." Pelvic limb gait, the authors note, is also more readily confounded by coxofemoral osteoarthritis and other orthopedic disease, which may obscure any cognitive signal.¹

Measurement reliability was excellent, with both intra-observer and interobserver intraclass correlation coefficients above 0.97, supporting the method's repeatability.¹

What it means in the exam room

The authors are explicit that stride length is not a standalone diagnostic. "The researchers add that while stride length alone isn't sufficient as a diagnostic tool, it is useful in creating a larger picture of a dog's cognitive status," per the university.² Rather, its value is as an adjunctive, trackable marker—most useful when measured over time alongside cognitive questionnaires. "Our results show that cognitive decline does have a small effect on stride length and this could serve as an early indicator of functional decline in aging dogs," Olby said.² "It could also serve as a useful marker of an individual dog's overall health trajectory when it is monitored over time."

Because the measurement requires only a short, standardized walkway and routine video, the approach is plausibly scalable to general practice. The authors flag limitations: cognition and pain were owner-reported rather than clinically diagnosed, causality cannot be inferred from the observational design, and dogs had to be ambulatory to participate—likely underrepresenting the most severely affected patients.¹ The reliability estimates, while strong, came from small subsets and should be considered preliminary.¹

References

1. Rafatpanah Baigi S, Stywall A, Yang CC, et al. Thoracic limb stride length is associated with cognitive impairment in aging dogs. Front Vet Sci. 2026;13:1814017. doi:10.3389/fvets.2026.1814017
2. Peake T. Stride length is marker for cognitive decline in dogs. News release. North Carolina State University. June 25, 2026. Accessed July 7, 2026. https://news.ncsu.edu/2026/06/stride-cognitive-decline-dogs/