When does a dog become senior?
There is no precise universal answer — it depends significantly on size. Large and giant breeds age faster and are considered senior from around six or seven years. Medium dogs from around eight. Small breeds may not reach ‘senior’ status until nine or ten years old.
More useful than a specific age is watching for the changes described below and having twice-yearly veterinary check-ups from middle age onwards.
What changes in senior dogs
Joints and mobility
Arthritis is the most common health condition in senior dogs. Watch for stiffness after rest, reluctance to jump or use stairs, or a change in gait. Early management makes a significant difference.
Senses
Hearing and vision decline gradually. A dog that seems unresponsive or startles easily when approached from behind may be experiencing hearing loss rather than selective hearing. Adjust your communication accordingly — hand signals become more important.
Cognitive changes
Canine Cognitive Dysfunction (CCD) is broadly analogous to dementia in humans. Signs include disorientation, disturbed sleep-wake cycles, house-training lapses, and reduced interaction. It is manageable but not reversible. Speak to your vet if you notice these signs.
Weight changes
Senior dogs may gain weight due to reduced activity, or lose weight due to reduced muscle mass or dental pain making eating uncomfortable. Both deserve veterinary assessment.
Adjusting exercise
Senior dogs still need daily exercise — mental and physical activity supports joint health, weight management, and cognitive function. The key adjustments are:
- Shorter, more frequent walks rather than one long one
- Avoiding high-impact activities on hard surfaces
- Swimming, where available, is excellent for arthritic dogs
- Sniff-led walks — letting the dog set the pace and explore — are highly enriching and not physically demanding
Diet in older age
Senior-specific diets typically have reduced calories and adjusted protein, phosphorus, and sodium levels. Whether your dog needs one depends on their individual health status. A dog with kidney disease has different dietary needs to a healthy senior. Discuss with your vet before switching.
Veterinary care
Twice-yearly check-ups allow problems to be caught earlier when they are more manageable. Blood tests that are normal now provide a baseline to compare against in future. Dental health becomes increasingly important — dental disease is painful and can affect overall health significantly.
