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There is no single test that confirms canine cognitive dysfunction syndrome (CCDS). A veterinarian assesses a pattern of progressive behavior changes, examines the dog, and uses laboratory tests to look for other causes. Brain MRI and cerebrospinal fluid (CSF) testing may be considered in selected cases; they are not automatic requirements for every dog.
What the veterinarian is assessing
CCDS is a chronic, progressive, age-associated neurodegenerative syndrome. Its signs are commonly organized as DISHAA: disorientation; changes in social interaction; sleep disruption; house soiling or changes in learning and memory; activity changes; and anxiety. A progressive pattern can prompt an assessment, but behavior changes alone cannot rule out pain, organ dysfunction, or disease affecting the brain.
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The American Animal Hospital Association (AAHA) reported that approximately 14–22.5% of dogs older than 8 years have age-related cognitive impairment. That figure is an estimate for that age group, not a test result or a measure of CCDS diagnostic accuracy. AAHA’s cognitive dysfunction guidance was published December 13, 2022.
What to expect at the first veterinary visit
History of changes over time
The veterinarian will ask what has changed, when it started, how often it happens, and whether it is getting worse. Concrete examples help: getting stuck in familiar spaces, changed responses to familiar people or pets, waking or pacing at night, indoor accidents, forgetting learned behaviors, reduced or increased activity, or new fearfulness.
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A questionnaire such as CADES can help organize observations and track changes over time. AAHA describes owner questionnaires as assessment and monitoring aids, not stand-alone diagnostic tests. A timeline, completed questionnaire, and brief videos of relevant behavior can make the history easier to discuss.
Physical, orthopedic, and neurologic examinations
The proposed first diagnostic level includes physical, orthopedic, and neurologic examinations. These help identify problems such as pain or other illness that could explain behavior changes. A neurologic exam assesses functions such as gait, posture, cranial nerves, reflexes, and limb function. The working-group guideline considers a normal neurologic examination, or findings consistent with symmetrical, diffuse forebrain dysfunction, compatible with its first-level criteria.
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As neurologist Natasha Olby of North Carolina State University put it, “You need to do a neuro exam.” The Merck Veterinary Manual’s overview of neurologic evaluation in dogs describes the examination as part of assessing nervous system disorders.
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The proposed first level also includes laboratory work to check for alternate causes. AAHA identifies biochemical evaluation and urinalysis as integral to evaluating illness that may resemble cognitive change. The veterinarian chooses any additional tests based on the dog’s history and examination; there is no single fixed laboratory panel specified for every dog.
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How the proposed diagnostic levels differ
The Canine Cognitive Dysfunction Syndrome Working Group’s guideline, published online December 24, 2025, and in print April 1, 2026, describes levels of evidence for assessing the likelihood of CCDS. They are not consumer packages, and the more advanced level is not required in every case.
| Diagnostic level | Evidence considered | What it means in practice |
|---|---|---|
| Level 1 | Progressive DISHAA signs; history; physical, orthopedic, and neurologic examinations; laboratory work; and assessment of relevant comorbidities. | A clinical assessment that looks for a consistent pattern while checking for other explanations. |
| Level 2 | Brain MRI showing cortical atrophy, together with CSF cell counts within normal limits. | A more advanced veterinary evaluation considered in selected cases; imaging and CSF findings are interpreted alongside the clinical picture. |
The guideline also describes definitive postmortem confirmation through tissue examination, including cortical atrophy, amyloid deposition, myelin loss, neuroinflammation, and amyloid angiopathy. This is not a routine test for a living dog.
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When MRI or CSF testing may be discussed
MRI can help investigate structural disease and, under the working group’s proposed second-level criteria, may show cortical atrophy. An MRI finding by itself does not establish CCDS; it needs to be interpreted with the dog’s signs and other examination results.
CSF is collected by a veterinarian through a spinal tap and analyzed for evidence of inflammation, infection, or other central nervous system disease. MRI and CSF analysis are clinical procedures used in selected neurologic workups, not tests owners perform at home. The veterinarian weighs their potential value against the dog’s health and the question the tests are meant to answer.
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Why other causes must be considered
Similar signs can arise from conditions including pain, organ dysfunction, or intracranial disease such as a tumor. The working group’s first-level approach includes checking for alternate causes and considering whether signs persist after relevant comorbidities are managed. This is why a behavior checklist alone cannot distinguish CCDS from other medical problems.
The sources cited here do not establish a consumer blood test that confirms CCDS. In its February 13, 2026 report, AAHA said commercially available CCDS biomarker tests were not available at that time. The working group identifies blood biomarkers and cognitive-testing batteries suited to routine clinical settings as priorities for future development; availability may change.
How severity may be described
The working group proposes mild, moderate, and severe stages based on the caregiver’s view of quality-of-life impact alongside veterinary assessment:
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- Mild: Signs are subtle and day-to-day function is generally preserved.
- Moderate: Signs interfere more with daily activities and prompt management changes.
- Severe: Signs are overt and debilitating and may affect basic function.
What can affect the testing plan
Not every dog will undergo MRI or CSF testing. AAHA notes that extensive diagnostics may be limited by cost or anesthesia concerns, particularly for dogs with other health problems, and that decisions should be individualized. The veterinarian considers the history, examination, possible alternatives, and the dog’s overall health when recommending next steps. The cited sources do not provide a universal price range or require advanced diagnostics in every suspected case.
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