Dogs age faster than humans, with life stages compressed into shorter timeframes. Recognising normal ageing versus treatable conditions, and proactively managing age-related changes, significantly improves welfare throughout later life.
Canine ageing involves multiple organ system changes: reduced kidney and liver function affects drug metabolism and toxin processing; decreased cardiac reserve limits exercise tolerance; lens opacity (nuclear sclerosis, cataracts) impairs vision; reduced hearing acuity; muscle mass loss (sarcopenia); integument changes including coat thinning and greyening; reduced intestinal function affecting nutrient absorption; and immune senescence increasing infection susceptibility. These changes are gradual but cumulative in their welfare impact.
Canine cognitive dysfunction syndrome (CDS) affects 14-35% of dogs aged 8-11 years, rising to 68% in dogs over 15. DISHA signs—Disorientation, social Interactions changed, Sleep-wake cycle disruption, House training loss, Activity changes—provide a clinical framework. Early recognition and management (SAMe supplementation, medium-chain triglyceride diets, environmental enrichment, cognitive stimulation) slows progression. Selegiline and propentofylline have pharmacological evidence. Owner education prevents CDS signs being dismissed as inevitable ageing.
Chronic pain from osteoarthritis, dental disease, and other age-related conditions is widespread in older dogs but systematically under-recognised. Subtle behavioural changes—reduced play, reluctance to climb stairs, altered sleep position, decreased greeting behaviour, irritability—often precede obvious lameness. Annual (or semi-annual) veterinary health checks incorporating systematic chronic pain assessment using validated scales enable proactive management rather than reactive response to advanced disease.
Senior dog diets should provide: high biological value protein to maintain muscle mass (sarcopenia prevention); appropriate caloric density (reduced to prevent obesity, but maintained if underweight); adjusted mineral levels (reduced phosphorus if renal disease present); joint-supporting omega-3 fatty acids; and antioxidants supporting cognitive and immune health. Individual nutritional assessment with veterinary guidance outperforms generic "senior food" approaches for dogs with specific health conditions.
Regular, structured quality of life assessment enables tracking of good versus difficult days over time. Owner questionnaires (HHHHHMM scale—Hurt, Hunger, Hydration, Hygiene, Happiness, Mobility, More good days than bad) provide a practical monitoring framework. Decline in quality of life, despite optimised management, guides end-of-life decision-making. Access to home euthanasia services and advance planning for end-of-life reduce stress and enable more peaceful, timely decisions.