Canine cognitive dysfunction syndrome (CDS) is a neurodegenerative condition analogous to Alzheimer's disease, affecting a significant proportion of older dogs and causing progressive behavioural and cognitive decline.
CDS causes genuine suffering: the disorientation and anxiety experienced by cognitively declining dogs are analogous to the confusion and distress documented in human dementia patients. Nightly vocalisation, getting stuck in corners, staring at walls, and failing to recognise familiar people are not merely inconvenient — they indicate a profoundly altered experience of the environment. Welfare-conscious management combines environmental modification (stable layout, nightlights, close sleeping proximity to owner), cognitive stimulation through appropriate enrichment, pharmacological support where indicated, and — critically — honest quality-of-life assessment to recognise when treatment is no longer preventing suffering. Delayed euthanasia decisions in end-stage CDS are a welfare failure that veterinary and owner education must address.