Senior Dog Health: What Changes to Monitor After Age 7

Seven is a rough threshold, not a cliff edge. Most dogs don't suddenly become geriatric on their seventh birthday. What changes is the rate at which things can change - and the value of catching those changes early rather than late. According to the PDSA PAW Mini Report 2025, there are 11.1 million pet dogs in the UK - and with the average dog lifespan ranging from 10–15 years, a significant proportion of the UK's dog population is in their senior years at any one time, making age-related monitoring a widespread practical need.

For large breeds, physical ageing often starts earlier. A Great Dane at seven is genuinely old. A Jack Russell at seven is middle-aged at best. But across most breeds, the second half of a dog's life benefits from more frequent monitoring and a lower threshold for investigating something unusual.

Why monitoring matters more in older dogs

Many of the conditions that become more common with age - cancer, heart disease, kidney disease, hypothyroidism, Cushing's syndrome, cognitive dysfunction - respond better to management when they're identified early rather than after significant progression.

An annual check-up that finds a heart murmur lets you start monitoring and plan treatment. The same heart murmur found eighteen months later, when the dog is already showing symptoms, narrows the options. The difference in outcome between those two scenarios is often significant.

This is the practical case for twice-yearly vet visits from age seven onwards in large breeds, and from age nine or ten in smaller ones. It's also the case for monthly weight checks and regular notes on behaviour and energy - because owners notice things between appointments that vets can't.

Weight

Gradual weight loss in older dogs is one of the most reliably missed changes. You see your dog every day. You adjust to their new shape. A photo from two years ago compared to now is often more revealing than looking at them in the mirror.

Weigh monthly. For large dogs where bathroom-scale weighing is impractical, a quick trip to the vet's reception scales takes five minutes and is usually welcomed.

Unexplained weight loss in a senior dog - particularly weight loss despite a normal or increased appetite - is worth prompt investigation.

Weight gain matters too. An older dog who's less active but still eating the same amount will gradually gain weight, which increases strain on joints and the heart. The PDSA PAW Mini Report 2025 found that 82% of UK dog owners are unaware of their dog's body condition score, and that veterinary professionals estimate 46% of UK dogs are overweight or obese - with senior dogs particularly at risk from the compounding effects of reduced mobility, slower metabolism, and unchanged food intake.

Mobility and joint health

Senior dogs are most commonly affected by arthritis, hip dysplasia, kidney disease, cataracts, cancer, and cognitive dysfunction. Each has its own monitoring guide.

Reduced willingness to jump up, reluctance on stairs, stiffness after rest, or a slightly altered gait are early signs of arthritis or other joint changes. These are easy to miss when they develop slowly.

Take note when your dog hesitates before jumping into the car when they didn't used to. Note when the morning walk seems shorter than it used to. These observations, with dates, are exactly what a vet needs to assess whether what's happening is normal ageing, manageable arthritis, or something that warrants further investigation.

Effective arthritis management - anti-inflammatories, joint supplements, physiotherapy, weight management - makes a meaningful difference to quality of life. It works better started early than after the dog has clearly been in pain for months.

Appetite and thirst

An older dog who's drinking noticeably more than usual is showing a symptom that warrants a blood and urine test. Increased thirst in senior dogs is associated with kidney disease, diabetes mellitus, Cushing's syndrome, and liver disease - all conditions that are better managed when caught early.

Changes in appetite should be noted with dates and context. A dog who's suddenly more food-motivated than usual may have Cushing's syndrome or diabetes. One who's lost interest in food may have dental pain, nausea from an emerging condition, or reduced sense of smell.

Coat and skin

Coat changes in older dogs often reflect what's happening internally. A dull, dry coat, or one that's thinning symmetrically on the flanks, can indicate hypothyroidism or Cushing's syndrome. Increased skin lumpiness - not individual lumps, but a general change in texture - is worth showing a vet.

Check your dog's skin monthly when grooming. Note any new lumps or bumps: where they are, roughly how big, and when you first noticed them. Any lump that grows, changes colour, becomes ulcerated, or has been there for more than a month should be assessed. Most are benign in older dogs, but not all.

Cognitive changes

Canine cognitive dysfunction (CCD) - sometimes called doggy dementia - is underdiagnosed because its signs can be subtle and are often attributed to normal ageing. Signs include:

• Confusion in familiar environments, getting "stuck" in corners
• Disrupted sleep patterns, waking at night or sleeping more during the day
• Reduced engagement with family, less interest in toys or play
• House-training accidents after years of reliability
• Staring at nothing, apparent disorientation

These changes often start gradually. A log of when you first noticed them, and how they've progressed, helps a vet distinguish CCD from other causes (pain, sensory changes, systemic illness) and guides management options.

Eyes and hearing

Cloudy, blue-grey haze in the lens is often nuclear sclerosis - a normal age-related change in older dogs that doesn't significantly impair vision and doesn't require treatment. It's different from cataracts, which cause more significant vision impairment and appear whiter.

If your dog is startling more easily, not responding to quiet sounds, or seems less aware of things behind them, hearing loss may be developing. Sudden deafness warrants investigation; gradual age-related hearing reduction is common and manageable with adjusted communication.

Frequently Asked Questions

How often should a senior dog see the vet? Twice a year is the general recommendation from most vets for dogs over seven in larger breeds, and over nine or ten in smaller breeds. Even when they seem healthy. Many conditions that benefit most from early treatment show no obvious symptoms in their early stages.

My dog seems happy and healthy at ten. Do I still need to monitor this closely? Yes - partly because "happy and healthy" is what good monitoring helps maintain. Dogs don't complain. A dog with early kidney disease or a developing heart condition may seem completely fine until the condition is well advanced. Regular blood and urine checks from age seven catch things that don't show up in how a dog looks or behaves.

My old dog has slowed down. Is that just age? Sometimes, yes. But slowing down can also be pain, heart disease, anaemia, hypothyroidism, or other treatable conditions. "Just old age" shouldn't be the conclusion without a vet ruling out addressable causes. A vet check gives you confidence that what you're seeing is genuinely age-related rather than something that can be managed.

What blood tests should senior dogs have? A senior blood panel typically includes a full blood count, biochemistry (kidney and liver function, glucose), and thyroid levels. Your vet may also recommend a urine test. Frequency depends on the individual dog - your vet can advise. The point is having a baseline before anything is obviously wrong, so changes over time are visible.

Is there anything I can do to help an ageing dog stay well? Weight management is the single highest-impact intervention - an overweight senior dog faces significantly higher risks of joint disease, heart disease, and diabetes. Appropriate exercise maintained at a manageable level, dental care, and regular monitoring all contribute. Some vets recommend joint supplements for senior dogs before signs of arthritis appear; discuss this with yours.