What is canine cognitive dysfunction syndrome?
Canine cognitive dysfunction syndrome (CDS) is a neurodegenerative condition affecting older dogs β the functional equivalent of human dementia. It is caused by accumulation of beta-amyloid protein in the brain and reduced cerebral blood flow. It is estimated to affect around 50% of dogs over 11 years old.
Symptoms: the DISHA acronym
- D β Disorientation: stares at walls, gets lost in the house or garden, fails to recognise familiar people or places.
- I β Interaction changes: less social contact, may become irritable or indifferent to the family and other pets.
- S β Sleep alterations: sleeps more during the day, restless or wakeful at night (inverted sleep-wake cycle).
- H β House soiling: accidents indoors without another medical explanation.
- A β Activity changes: less interest in play, walks or the environment; sometimes repetitive, purposeless behaviours.
Diagnosis
There is no single definitive test β diagnosis is by exclusion. Your vet will first rule out treatable conditions with similar signs: hypothyroidism, diabetes, kidney disease, hypertension, brain tumour, chronic pain, vision or hearing loss. If no other cause is found, CDS is the diagnosis.
Treatment and management
- Selegiline (Anipryl/Selgian): the only drug licensed specifically for CDS in multiple countries. Increases dopamine and has neuroprotective effects. Improvement in ~70% of cases, especially when started early.
- Propentofylline: improves cerebral blood flow; can be combined with selegiline.
- Diets enriched with antioxidants and omega-3 fatty acids: Hill's b/d, Royal Canin Mature Consult.
- SAMe and phosphatidylserine: supplements with moderate evidence in small studies.
- Melatonin: to normalise the sleep-wake cycle in dogs with night-time restlessness.
Environmental adaptations
- Maintain stable routines (same feeding times, walks, sleeping place).
- Don't rearrange furniture β dogs with CDS rely on spatial memory for navigation.
- Add extra resting spots; block stairs if there is fall risk.
- Gentle enrichment: sniffing activities, simple games, short frequent walks.
- Leave a nightlight on if the dog becomes disoriented in darkness.
Prognosis
CDS is progressive β there is no cure. However, early detection and treatment can significantly slow progression and improve quality of life for months or years. If your older dog shows any DISHA signs, raise them with your vet at the next check-up.