Canine Cognitive Dysfunction: Welfare in Aging Dogs in 2026

Canine cognitive dysfunction syndrome (CDS) is a progressive, dementia-like condition affecting a significant proportion of older dogs, causing disorientation, anxiety, and sleep disruption with major welfare implications.

Key Facts

CDS affects an estimated 14-35% of dogs over 8 years, increasing to over 60% in dogs over 15
Signs include disorientation, changes in social interactions, altered sleep-wake cycles, house soiling, and anxiety
Selegiline and dietary supplements including omega-3 fatty acids and antioxidants have demonstrated welfare benefits
Environmental modification and enrichment slow cognitive decline and maintain quality of life in affected dogs

Welfare Considerations

Canine cognitive dysfunction causes significant, progressive welfare compromise. Disorientation causes anxiety and distress; disrupted sleep prevents adequate rest; house soiling can lead to owners misinterpreting signs as behavioural disobedience. CDS is often attributed to normal aging rather than recognised as a treatable condition, meaning many dogs experience preventable suffering. Diagnosis using validated screening questionnaires, combined with medical management and environmental enrichment, meaningfully improves quality of life. Regular quality of life assessment as disease progresses guides end-of-life decisions appropriately.

What You Can Do

Use validated CDS screening questionnaires for all dogs over 8 years at annual veterinary visits
Discuss selegiline or dietary supplementation with your vet if CDS signs are confirmed
Maintain a consistent routine and enrich the environment to support cognitive function in older dogs
Monitor and document progression using quality of life tools to guide treatment and end-of-life decisions