When is a dog considered a senior? The answer depends on its size: a toy or small dog is usually considered a senior from about 10 years, a medium dog from 8 to 10 years, a large dog from 7 to 8 years, and a giant dog from 6 to 7 years. Those are rough guides, not hard lines: a dog becomes a senior gradually, and your vet may move the boundary earlier or later depending on your individual dog's health. This guide gives the senior thresholds by size, the signs of ageing to watch for, and how care should change. Every figure is a guide, because individual dogs vary. The dog age calculator works out the human-age equivalent for any age, and the dog lifespan estimator estimates a lifespan for any breed and size.
The short version is: a dog is a senior when it starts to slow down, sleep more, and need more care — and that happens earlier for large breeds than for small ones. A giant dog can be a senior at 6 years, while a toy dog may not be a senior until 10. Once your dog is a senior, it needs twice-yearly vet checks, a diet review, and exercise that stays regular but gentler. The senior dog diet guide covers feeding in the senior years, and the how long do dogs live guide gives the lifespans by size.
When is a dog considered a senior
The table below gives the age at which a dog of each size is usually considered a senior, with the typical lifespan for that size. Use it to know when to start senior care — and to know that the boundary is a guide, not a switch: a dog does not become old overnight.
| Size | Senior from | Typical lifespan |
|---|---|---|
| Toy | About 10 years | 12–16 years |
| Small | About 10 years | 12–15 years |
| Medium | 8–10 years | 10–14 years |
| Large | 7–8 years | 10–12 years |
| Giant | 6–7 years | 7–10 years |
Read the table from top to bottom and the pattern is clear: the larger the dog, the earlier it becomes a senior, and the shorter it typically lives. A giant dog is usually a senior from 6 to 7 years, while a toy dog is usually a senior from about 10 years. A cat of any size is usually a senior from about 11 years, and geriatric from about 15. The dog life expectancy by breed guide gives the lifespans breed by breed.
Signs your dog is becoming a senior
A dog that is becoming a senior will sleep more, play for shorter periods, and become more set in its routines. It may be slower to get up, especially after rest, and it may be less keen on long walks or hard play. Its coat may go grey around the muzzle, its eyes may look cloudy, and it may hear less well. It may drink more, eat less, or lose weight — and any of those is worth a vet check, because they can be signs of disease as well as of age.
A senior dog may also become more anxious, more clingy, or more confused: it may pace at night, forget where the door is, or stare into space. Those can be signs of cognitive decline, which is common in senior dogs and which a vet can help with. A dog that is checked twice a year as a senior will have its problems found earlier, when they are easier to treat. The dog calorie calculator guide works out how much to feed, and the is my dog overweight calculator guide helps you check its condition.
How care should change for a senior dog
Once your dog is a senior, take it to the vet twice a year, not once: a senior dog can develop problems fast, and a vet who sees it every six months will notice changes sooner. Review its diet: a senior dog usually needs fewer calories, because it moves less, but it needs good-quality protein to keep its muscle, and it may need a diet that supports its joints, its kidneys, or its teeth. Keep it exercising, but gentler and shorter: a senior dog still needs exercise, but it should not be pushed.
Keep its mind active, too: a senior dog that is bored will decline faster than one that is kept interested. Short training sessions, new smells, gentle play, and company all help. Keep its weight steady: a senior dog that gains weight puts more strain on its joints, and a senior dog that loses weight needs a vet check, because weight loss in a senior can be a sign of kidney disease, thyroid disease, or cancer. The senior dog diet guide covers feeding in the senior years.
Senior care by size
A giant dog becomes a senior earliest, from 6 to 7 years, and it needs senior care earliest: twice-yearly vet checks, a diet review, and gentler exercise from about 6 years. A large dog becomes a senior from 7 to 8 years, a medium dog from 8 to 10, and a toy or small dog from about 10. A cat of any size becomes a senior from about 11 years, and geriatric from about 15 — but a large cat may need senior care earlier, because it typically lives 10 to 14 years, against 12 to 16 for small and medium cats.
Whatever the size, the care is the same: twice-yearly vet checks, a diet review, gentler exercise, and watchfulness for the early signs of disease. A dog that is checked regularly as a senior will live longer and feel better than one that is not. The dog lifespan calculator guide works out an estimated lifespan for your dog, and the longest living dog breeds guide gives the breeds that live longest.
When to ask a vet about ageing
Ask a vet if your dog is drinking more than usual, eating less, losing weight, coughing, limping, or has a lump that does not go away. Ask, too, if it is sleeping much more than usual, if it is confused or anxious, or if it is having trouble getting up or using the stairs. A dog that is checked early has a better chance than one that is checked late, and a vet who knows your dog will notice changes sooner.
Ask your vet, as well, about the senior boundary for your individual dog: the table above gives the usual ages, but your vet may move the boundary earlier or later depending on your dog's breed, its weight, and its health. A dog that is overweight, or that has a health condition, may need senior care earlier than the table suggests. The healthiest dog breeds guide gives the breeds with the longest typical lifespans and the fewest listed health issues.
For related reading, see the dog age calculator, the dog lifespan estimator, the senior dog diet guide, the how long do dogs live guide, the dog lifespan calculator guide, the dog calorie calculator guide.
Frequently asked questions
When is a dog considered a senior?
A toy or small dog is usually considered a senior from about 10 years, a medium dog from 8 to 10 years, a large dog from 7 to 8 years, and a giant dog from 6 to 7 years. Those are rough guides, and your vet may move the boundary earlier or later depending on your individual dog's health.
What are the signs of ageing in a dog?
A dog that is becoming a senior will sleep more, play for shorter periods, and become more set in its routines. It may be slower to get up, less keen on long walks or hard play, and its coat may go grey around the muzzle. It may drink more, eat less, or lose weight — and any of those is worth a vet check.
How often should a senior dog see a vet?
Twice a year, not once. A senior dog can develop problems fast, and a vet who sees it every six months will notice changes sooner. Review its diet at the same time: a senior dog usually needs fewer calories, but good-quality protein to keep its muscle.
Should a senior dog still exercise?
Yes — a senior dog still needs exercise, but gentler and shorter. Keep it regular, keep it gentle, and do not push it. A senior dog that is exercised will keep its muscle, its joints, and its mind better than one that is not.
Does a senior dog need a different diet?
Usually, yes: a senior dog usually needs fewer calories, because it moves less, but it needs good-quality protein to keep its muscle, and it may need a diet that supports its joints, its kidneys, or its teeth. Ask your vet, and review the diet at each vet visit.
When should I ask a vet about ageing?
Ask a vet if your dog is drinking more than usual, eating less, losing weight, coughing, limping, or has a lump that does not go away. Ask, too, if it is sleeping much more than usual, if it is confused or anxious, or if it is having trouble getting up or using the stairs.
Results on this page are estimates for general information only and are not veterinary advice. If your pet is ill, underweight, overweight, pregnant, or has a health condition, consult your veterinarian before changing diet or care.