New CCDS guidelines aim to standardize diagnosis in aging dogs

CURRENT FULL VERSION: A new consensus statement is trying to solve a basic but consequential problem in canine cognitive dysfunction syndrome: before veterinarians can diagnose CCDS consistently, they need to agree on what counts as CCDS. The international CCDS Working Group, led by NC State neurologist Natasha Olby, has now published the first consensus-based guidelines for diagnosis and monitoring in JAVMA, giving the profession a common definition, staging system, and diagnostic framework for a condition that’s often described as canine dementia. (elib.tiho-hannover.de)

The push for definitions reflects a broader shift in geriatric canine medicine. Dogs are living longer, and age-related neurodegenerative disease is becoming more visible in practice, but CCDS has remained difficult to pin down because behavior changes overlap with pain, sensory decline, systemic disease, and other neurologic conditions. The working group said the lack of consensus standards has contributed to diagnostic inaccuracy and made treatment decisions, monitoring, and research harder. That need was also echoed in a 2025 survey of U.S. veterinarians, which found significant gaps in CCDS diagnosis and management and concluded that clear guidelines were needed. (elib.tiho-hannover.de)

The new paper defines CCDS as a chronic, progressive, age-associated neurodegenerative syndrome marked by cognitive and behavioral changes that affect daily life. It centers those changes in the DISHAA domains: disorientation, social interaction changes, sleep disruption, house soiling, learning and memory changes, activity changes, and anxiety. The group also proposes three severity stages. Mild CCDS involves subtle, low-frequency changes with preserved function and signs that are often dismissed as normal aging; moderate disease interferes more clearly with daily activities; severe disease significantly impairs basic function. (elib.tiho-hannover.de)

Clinically, the framework is built around two levels of diagnostic certainty. Level 1 relies on a consistent history of progressive DISHAA signs, exclusion of alternate causes through physical, orthopedic, and neurologic examination and laboratory work, appropriate management of relevant comorbidities, and either a normal neurologic exam or evidence of symmetrical diffuse forebrain dysfunction. Level 2 adds advanced diagnostics, specifically MRI evidence of cortical atrophy with normal CSF cell counts. The paper also recommends routine behavioral screening every 6 to 12 months beginning at age 7 to establish a baseline, with ongoing monitoring every 6 months by age 10. For everyday practice, the authors recommend the DISHAA questionnaire, while noting that CADES and CCDR remain useful alternatives. (elib.tiho-hannover.de)

Industry and professional reaction has framed the publication as both practical and foundational. In the AKC Canine Health Foundation announcement, CEO Stephanie Montgomery said evidence-based standards are what veterinary medicine needs so clinicians, researchers, and pet parents can use the same scientific language. Working group member Holger Volk said standardized criteria should support earlier and more consistent diagnosis in practice, while also laying groundwork for future biomarker studies and cognitive test batteries. Olby told AKC CHF that the group is now focused on making sure primary veterinarians and dog caregivers can access and use the guidance, and AAHA’s coverage highlighted the real-world barriers she cited, including cost, time constraints, and the limited practicality of MRI and CSF workups in many cases. (akcchf.org)

The monitoring question is also starting to expand beyond questionnaires alone. Separate NC State-led research published in Frontiers in Veterinary Science followed 88 senior and geriatric client-owned dogs from the Longitudinal Study of Canine Neuroaging, with repeat evaluations about every six months that included physical, neurologic, and orthopedic exams, mobility assessment, hearing testing, blood work, owner questionnaires, and a standardized cognitive test. On a 5-meter indoor walkway, trained observers measured stride length from video and normalized it to withers height. The main finding was that shorter height-adjusted thoracic limb stride length was associated with greater owner-reported cognitive impairment on CADES, even after adjustment for age and pain scores on the Canine Brief Pain Inventory. A 10-point increase in CADES corresponded to about a 1.2% reduction in thoracic limb stride length, while pelvic limb stride length did not show the same relationship. The authors reported excellent interobserver and intra-observer reliability and concluded that thoracic limb stride length could serve as an objective, scalable functional mobility measure for research and clinical monitoring, though not as a standalone diagnostic test. (frontiersin.org)

That distinction matters because the biologic signal may be subtle but still useful. The researchers noted that thoracic limbs are more involved in braking and postural stabilization, and may be under greater cortical influence than pelvic limbs, making them potentially more sensitive to changes in visual or spatial awareness associated with cognitive decline. In the multivariable model, the CADES association with stride length persisted after adjustment for age and pain, while age alone was not a significant predictor. In practical terms, that makes gait a plausible future adjunct for longitudinal monitoring as the field looks for objective measures that are easier to use than MRI, CSF analysis, or formal cognitive testing in routine practice. (frontiersin.org)

Why it matters: For veterinary professionals, this is a standardization story more than a therapeutics story. The guidelines don’t eliminate the messiness of diagnosing CCDS, but they do give clinicians a more defensible way to approach it: screen earlier, document signs in a structured way, rule out common mimics, and reserve advanced diagnostics for higher-certainty cases or when another brain disease is plausible. That matters for case management, referral decisions, client conversations, and record quality. It may also help practices identify dogs earlier, when signs are still mild and when intervention, environmental modification, and monitoring may be more feasible. Just as important, a shared case definition should improve comparability across studies at a time when the field is trying to validate biomarkers and build stronger evidence for treatment and monitoring. The newer stride-length findings point in the same direction, suggesting that objective mobility measures could eventually complement owner questionnaires in serial follow-up, especially if they can be collected reliably in general practice or referral settings. (elib.tiho-hannover.de; frontiersin.org)

The publication also arrives alongside a broader expansion of CCDS infrastructure. AKC CHF said it is partnering with Olby on an online resource hub intended to centralize science, guidance, and practical tools for veterinarians and pet parents. Meanwhile, recent reviews continue to describe CCDS as underdiagnosed and emphasize the need for practical algorithms, critical appraisal of biomarkers, and realistic translation of research tools into primary care. Taken together, that suggests the field is moving from awareness toward a more formal clinical framework, even if routine biomarker testing and hands-on cognitive testing still aren’t ready for everyday use. The same is true for gait-based measures: promising as monitoring tools, but not yet replacements for structured history, exclusion of mimics, and serial behavioral assessment. (akcchf.org; frontiersin.org)

What to watch: The next phase will be whether these definitions are adopted in general practice, referral neurology, and clinical research, and whether that common language accelerates validation of blood biomarkers, simpler cognitive tests, more uniform monitoring protocols, and practical functional measures such as stride-length tracking over the next few years. (elib.tiho-hannover.de; frontiersin.org)