Dog Senior Cognitive Dysfunction Syndrome

Cognitive dysfunction syndrome is a neurodegenerative condition in older dogs causing dementia-like symptoms that impair welfare and require dedicated management to maintain quality of life.

Key Facts

CDS affects an estimated 14 to 35 percent of dogs over eight years of age
Signs include disorientation, altered sleep-wake cycles, house soiling, and changed social interaction
The DISHA framework categorises signs: Disorientation, Interactions, Sleep, Housetraining, Activity
Brain changes including amyloid plaque deposition are similar to those in human Alzheimer disease
Selegiline is licensed for CDS in dogs and may provide modest cognitive improvement
Antioxidant-enriched diets, environmental enrichment, and cognitive exercise may slow progression

Welfare Considerations

CDS causes significant welfare harm through disorientation, anxiety from loss of familiar routines, disturbed sleep causing nocturnal distress, and loss of normal social interaction. Dogs with CDS may become anxious and agitated, particularly at night, causing suffering that owners find distressing to witness. The condition is progressive and currently cannot be reversed. Management focuses on slowing progression through diet and enrichment, reducing anxiety through environmental predictability and anxiolytic support, and maintaining dignity and quality of life. Quality of life assessment is important to guide euthanasia decisions when welfare can no longer be maintained.

What You Can Do

Use the DISHA checklist at each vet visit to screen for early CDS signs in dogs over eight years
Maintain consistent daily routines to reduce disorientation in dogs with CDS
Discuss selegiline treatment and dietary antioxidant supplementation with your vet at diagnosis
Provide additional indoor toileting opportunities as housetraining reliability reduces
Assess quality of life regularly and discuss euthanasia timing honestly with your vet as the condition progresses