Feline Cognitive Dysfunction Syndrome: Dementia in Older Cats

Cognitive dysfunction syndrome (CDS) is the feline equivalent of dementia, affecting a significant proportion of cats over 15. Recognising the signs and managing the condition improves quality of life for affected cats and their owners.

Key Facts

CDS affects an estimated 28% of cats aged 11-14 and over 50% of cats 15 and older, making it a major geriatric welfare issue.
Signs follow the DISHA framework: Disorientation, altered Interactions, Sleep-wake cycle changes, House-soiling, Activity changes, and Anxiety.
Affected cats may vocalise at night, seem confused in familiar environments, fail to recognise owners, and lose litter box training.
The pathology involves amyloid plaques and neurofibrillary tangles in the brain — paralleling Alzheimer's disease in humans.
Diagnosis is clinical (by ruling out other causes of signs); there is no definitive test for CDS in living cats.
Selegiline (L-deprenyl) is licensed for CDS in dogs but used off-label in cats; evidence for efficacy in cats is limited.
Environmental enrichment, consistent routine, and night lighting may help reduce disorientation and anxiety.
CDS is progressive; quality of life assessments must be updated regularly as the disease advances.

Welfare Considerations

Cats with CDS experience a form of dementia that involves genuine confusion, anxiety, and disorientation. Night-time vocalisation — a hallmark sign — likely reflects distress rather than mere habit: affected cats appear genuinely frightened when disoriented in darkness. The loss of litter box habits causes hygiene problems and owner frustration, but represents a failure of the cat's memory and cognitive mapping rather than behavioural choice. Pain assessment is essential in geriatric cats with CDS as concurrent osteoarthritis frequently amplifies behavioural changes. Management focuses on reducing environmental complexity, maintaining routine, providing night lights, and treating concurrent pain or medical conditions. Owners often need support to recognise CDS as a welfare issue requiring medical response, not just "old age."

What You Can Do

Discuss geriatric cat health checks with your vet annually once your cat reaches age 10 — early CDS signs can be subtle.
Provide night lights in rooms your cat uses to reduce disorientation after dark.
Maintain consistent routines for feeding, play, and sleep — predictability reduces anxiety in cats with CDS.
Place additional litter boxes in accessible locations if house-soiling becomes a problem.
Ask your vet about nutritional supplements (omega-3s, antioxidants) and environmental enrichment strategies that may slow cognitive decline.
Use a quality-of-life tool to regularly assess your cat's wellbeing and guide decisions about ongoing care.