When is a dog actually senior?
There is no single age, because size drives lifespan more than almost anything else. A Great Dane may be considered senior at six; a small terrier often isn't until ten or eleven. The practical marker most vets use is roughly the last quarter of expected lifespan for that size and breed.
What changes at that point is not the care itself so much as the frequency of looking. Twice-yearly check-ups instead of annual ones, and baseline bloodwork while your dog is well, are what make it possible to spot a trend rather than a crisis.
| Size | Typical adult weight | Usually considered senior from |
|---|---|---|
| Small | Under 10kg / 22lb | 10–12 years |
| Medium | 10–25kg / 22–55lb | 8–10 years |
| Large | 25–45kg / 55–100lb | 7–8 years |
| Giant | Over 45kg / 100lb | 5–6 years |
Mobility: the most commonly dismissed change
Some stiffness after rest, a slower pace on walks, and more care on stairs are genuinely common with age. But the reason this section comes first is that osteoarthritis is both extremely common in older dogs and consistently under-treated, precisely because owners read it as ordinary aging rather than as pain.
The distinction that matters: general slowing that is symmetrical, gradual and doesn't change your dog's willingness to do things is likely age. Reluctance to jump into the car, hesitating at stairs they used to take at speed, difficulty rising from a lying position, or a change over days rather than months is pain — and pain in dogs is treatable.
Sleep, energy and confusion
More sleep and shorter bursts of energy are typical as dogs age — a gradual dimmer switch rather than a light going out. That pattern is expected and not concerning on its own.
What is a distinct signal is confusion. A dog who gets stuck in corners, stands at the hinge side of a door, paces at night, forgets a house-training habit held for a decade, or seems briefly not to recognise you is showing signs consistent with canine cognitive dysfunction — a condition with real management options, including diet, environmental structure and medication. It is not something to simply accept.
- Disorientation in familiar rooms, or getting stuck behind furniture
- Reversed day–night rhythm; pacing or vocalising overnight
- Reduced interaction, or a change in how they greet you
- House-soiling in a long-reliably-trained dog
- Staring at walls, or standing still with no apparent purpose
Appetite, weight and teeth
A modest reduction in appetite as activity decreases can be normal. Sudden weight loss, refusing food for more than a day, or new fussiness are not — and dental pain is a very common, very treatable cause of an older dog who has 'gone off' their food or started dropping kibble.
Weight gain matters just as much, and in the opposite direction. Excess weight makes arthritis meaningfully worse, and the reduced activity of an older dog means their previous portions may now be too much. This is the point to reassess portions against body condition rather than habit — our feeding guide covers the body-condition check, which applies at any age.
Increased drinking and urination deserves its own flag. It is one of the most common early signs of kidney disease, diabetes and Cushing's disease, and it is easy to normalise as 'drinking more in warm weather'. If the bowl is emptying faster than it used to, mention it.
Changes worth a same-week call
None of these are automatically serious. All of them are common in older dogs, and all of them are also common in conditions that respond much better to early treatment — which is exactly why 'let's watch it for a few months' is the wrong default at this age.
- Sudden lameness or reluctance to bear weight on a leg
- Noticeable weight loss or gain without a diet change
- New confusion, pacing, or getting stuck in corners
- A new lump, or any lump that is growing or changing quickly
- Increased drinking and urination beyond the usual pattern
- Bad breath, dropping food, or chewing on one side only
- Coughing, especially at night or after lying down
- Any change in breathing effort at rest
What actually helps at home
Most of what improves a senior dog's daily life costs very little. Traction is the highest-value change in almost every home: hard floors are genuinely difficult for a dog with weakening hind limbs, and a path of cheap runners between the bed, the water bowl and the door restores a lot of confidence.
Beyond that, the pattern is to reduce the number of times a day your dog has to do something hard. Ramps instead of jumping into the car, raised bowls if reaching down is uncomfortable, an orthopaedic bed away from draughts, and shorter, more frequent walks rather than one long one. Our Senior Dog Care Guide has the full room-by-room version along with a medication and vet-visit tracker.
Add traction on hard floors
Runners or rugs along the routes your dog uses most. This single change often produces the most visible improvement in confidence.
Remove the jumps
A ramp or steps for the car and the sofa. Repeated impact on arthritic joints is worth designing out.
Rethink the bed
Orthopaedic foam, somewhere warm and out of draughts, and easy to get into without climbing.
Shorten and repeat walks
Three short walks are usually kinder than one long one, and they keep joints moving without the next-day stiffness.
Keep the layout stable
For a dog losing sight or cognitive sharpness, furniture staying where it was is genuinely important. Night lights help too.
Thinking about quality of life
At some point this becomes the question, and it is easier to think about with a framework than in the middle of a bad week. Vets commonly use scales that track a handful of factors — pain control, appetite, hydration, hygiene, happiness, mobility, and the ratio of good days to bad — scored regularly rather than judged in a moment.
The value of scoring weekly is that it replaces a single hard judgement with a visible trend, and it protects you from both of the errors people most regret: acting too early on one bad day, and not noticing a slow decline because each day looked much like the last. Your vet can walk you through a scale and, importantly, will discuss it with you before it is urgent if you ask.