There is no single test that confirms canine cognitive dysfunction syndrome (CCDS). Diagnosis starts with a veterinarian reviewing a dog’s progressive behavior changes, examining the dog, and using laboratory tests to look for other explanations. Brain MRI and cerebrospinal fluid (CSF) testing may be considered in selected cases; they are not required for every dog.
What signs prompt a CCDS assessment?
CCDS is a chronic, progressive, age-associated neurodegenerative syndrome. Veterinarians often organize the behavior changes with the acronym DISHAA:
- Disorientation: getting lost or stuck in familiar places.
- Interaction changes: behaving differently toward familiar people or pets.
- Sleep disruption: changes in sleep or wake patterns.
- House soiling and learning or memory changes: indoor accidents or loss of learned behaviors.
- Activity changes: altered activity, including pacing.
- Anxiety: new or increased fear or anxious behavior.
A pattern of progressive changes can prompt an assessment, but behavior signs alone cannot rule out pain, organ dysfunction, or disease affecting the brain. AAHA reported that approximately 14–22.5% of dogs older than 8 years experience age-related cognitive impairment; that figure is not a diagnostic-accuracy measure. (AAHA, published December 13, 2022.)
What happens at the first veterinary appointment?
History and behavior timeline
The veterinarian will ask what changed, when it began, how often it happens, and whether it is progressing. Give concrete examples across the DISHAA areas rather than relying on a general impression that your dog is “acting old.” A timeline can help distinguish an ongoing pattern from a single incident.
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A questionnaire such as CADES may help organize observations and track changes over time. AAHA describes client questionnaires as assessment and monitoring aids; a score supports the clinical discussion but does not establish CCDS on its own. Bring a completed questionnaire and, if useful, brief videos of behaviors you have observed. (AAHA senior care guidelines.)
Physical, orthopedic, and neurologic examinations
The proposed first diagnostic level includes physical, orthopedic, and neurologic examinations. These help the veterinarian assess the dog’s general health, pain or mobility problems, and nervous system function. A neurologic examination can include evaluation of gait, posture, cranial nerves, reflexes, and limb function. The working group’s level 1 criteria allow a normal neurologic examination or findings consistent with symmetrical, diffuse forebrain dysfunction.
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Laboratory work
Laboratory testing helps look for medical conditions that can resemble cognitive change. AAHA describes biochemical evaluation and urinalysis as integral parts of assessing possible alternatives. There is no single fixed laboratory panel specified for every dog; the veterinarian selects tests in light of the history and examination. (AAHA senior care guidelines.)
How the proposed diagnostic levels differ
The Canine Cognitive Dysfunction Syndrome Working Group guideline proposes two clinical levels for determining how likely CCDS is. They are not consumer test packages, and the advanced level is not automatic.
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| Level | Evidence considered | What it involves |
|---|---|---|
| Level 1 | Progressive DISHAA behavior history, examination findings, and assessment of alternative causes. | History; physical, orthopedic, and neurologic examinations; laboratory work; and consideration of relevant comorbidities. |
| Level 2 | MRI findings of cortical atrophy together with CSF cell counts within normal limits. | Advanced veterinary evaluation with brain MRI and CSF collection and analysis; whether to pursue it depends on the individual case. |
The guideline was published online December 24, 2025, and in print April 1, 2026. (PubMed record for the working-group guideline.)
When might MRI or CSF testing be considered?
Brain MRI
MRI can help identify structural disease and, under the proposed level 2 criteria, may show cortical atrophy. That observation must be interpreted alongside the dog’s signs and other findings; MRI alone is not a definitive CCDS diagnosis.
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CSF analysis
CSF is collected by a veterinarian through a spinal tap. Analysis can help look for inflammation, infection, or other central nervous system disease. A normal CSF cell count is part of the proposed level 2 criteria, not a stand-alone confirmation of CCDS. Imaging and CSF analysis are clinical procedures used in neurologic workups, not owner-performed tests. (Merck Veterinary Manual, “The Neurologic Evaluation of Dogs”.)
The guideline also discusses definitive postmortem confirmation through histopathology, including findings such as cortical atrophy, amyloid deposition, myelin loss, neuroinflammation, and amyloid angiopathy. This is not a routine diagnostic test for a living dog.
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What else can cause similar behavior changes?
CCDS may be considered after other plausible causes have been assessed. AAHA identifies pain, organ dysfunction, and intracranial disease, including neoplasia, among possible alternatives. The working group’s proposed level 1 assessment includes looking for alternate causes and considering whether signs persist after relevant comorbidities are managed. The history, examination, and test results together guide the veterinarian’s judgment.
No consumer blood test is established by the cited sources as a way to confirm CCDS. The working group identifies blood biomarkers and cognitive-testing batteries suitable for routine clinical settings as future priorities. AAHA’s February 13, 2026 report said commercially available CCDS biomarker tests were not available at that time; availability can change. (AAHA, February 13, 2026.)
How severity may be described
The working group proposes mild, moderate, and severe stages based on caregiver-perceived quality-of-life impact and veterinary assessment. Mild signs are subtle and function is generally preserved; moderate signs interfere more with daily activities and may prompt management changes; severe signs are overt and debilitating and can affect basic function. Staging describes impact and severity; it does not replace the diagnostic assessment.
What affects whether advanced testing is recommended?
MRI and CSF testing are not required for every dog with suspected CCDS. AAHA notes that cost and anesthesia concerns—particularly for dogs with other health problems—can limit extensive testing, and that further diagnostics should be considered using veterinary judgment. The available sources do not establish a universal price range or a rule that every suspected case must undergo advanced testing. Discuss how the dog’s history, examination, potential alternative causes, and overall health affect the next step.
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