Canine cognitive dysfunction syndrome (CDS) is a progressive neurodegenerative condition analogous to Alzheimer disease that affects a significant proportion of elderly dogs, causing behavioral changes and confusion.
CDS causes significant psychological suffering through disorientation, anxiety, and progressive loss of the cognitive abilities that allow dogs to navigate their social and physical environment. Dogs with CDS may become anxious at night when disorientation worsens, vocalize repeatedly due to confusion, and lose the house training skills that are central to their role in human homes. The condition erodes the dog-human bond as behavioral changes make dogs more difficult to live with and less rewarding to interact with. Owners often struggle with the transition from the dog they knew to a confused, anxious animal with unpredictable behavior. Both the direct cognitive suffering and the secondary anxiety caused by disorientation represent significant welfare concerns. Early intervention with available treatments may slow progression and extend the period of reasonable quality of life.