How much exercise does a dog need? It depends on the dog, not a number

Ask how much exercise a dog needs and you'll get a confident number back — an hour a day, twice a day, and so on — that's worse than useless because it treats a chihuahua and a border collie as the same animal.

They aren't. Exercise needs vary enormously between dogs, and the amount that keeps one dog sane would barely touch another.

Getting it right matters, because the gap between what a dog needs and what it gets is behind a large share of the behaviour problems owners struggle with.

Breed and type set the baseline

The single biggest factor is what the dog was bred to do.

Working and sporting breeds — collies, spaniels, pointers, huskies, many terriers — were shaped over generations to work all day, and they arrive with the engine to match. They often need a great deal of exercise, and more than that, a job for their minds, or they become restless and destructive.

At the other end, some companion and giant breeds, and the flat-faced breeds that overheat easily, need far less and can be harmed by too much. A dog straining at a wall of energy and a dog happy with a gentle amble are both normal — for their type.

This is why a flat number misleads, and why choosing a dog whose energy matches your life matters so much before you ever pick one up. The mismatch between a high-drive breed and a low-activity household is one of the commonest sources of a miserable dog and a frustrated owner. Energy level is as real a breed trait as size and worth weighing as heavily, in the same way the wider fit questions run through adding a second dog to a home.

Age changes the equation

A dog's needs shift across its life, and two ends of it get exercise wrong most often.

Puppies look tireless but mustn't be over-exercised: their joints and growth plates are still forming, and too much hard, repetitive, high-impact activity — long runs, forced jogging, stairs, jumping — can do lasting harm to a body still under construction.

The rough guide many use is little and often, with free play they can stop when tired rather than enforced distance, and real caution with the large and giant breeds that grow for a long time.

Senior dogs swing the other way. They need to keep moving to stay mobile and hold weight down, but gentler and shorter, adjusted to stiffening joints and less stamina. And an unwell or recovering dog follows the vet's guidance rather than the usual routine.

The healthy adult in the middle is the one that can take the full amount its breed suggests — which is exactly why age has to be read alongside type rather than a single figure applied to a dog of any age.

The mind needs exercise as much as the body

The most under-appreciated part of the answer is that physical exercise alone doesn't tire a dog out, and for many dogs it isn't even the main need.

A bright, driven dog walked for an hour but never asked to think is still wired at home, because its brain has had nothing to do.

Mental exercise — sniffing on walks, training, puzzle feeders, scent games, problem-solving — is genuinely tiring in a way that laps of a field aren't, and a good sniff-heavy walk where the dog gets to use its nose does more for its contentment than a faster, longer march.

This is why the answer to a hyperactive dog is rarely just more running. Running a high-drive dog harder can build fitness that demands even more running, an exhausting arms race, while leaving the mind unstimulated.

The dogs that settle best get a mix: enough physical movement for their type, plus real mental work and the chance to use their instincts — sniff, search, chew, solve. A tired body with a bored brain is still a restless dog.

What a sniffing walk actually is

Worth being concrete, because it's the cheapest change most owners can make and the advice is usually too vague to act on.

A sniffing walk is one where the dog chooses the route and the pace, and you follow. It stops at a lamppost for ninety seconds; you wait. It doubles back to something; you go too. The distance covered will be a fraction of your usual walk and it will take the same time or longer.

What makes it tiring is the volume of information. A dog's nose is doing genuine work, and a long line in an open space where it can investigate freely leaves most dogs noticeably flatter afterwards than a brisk march of twice the distance.

It's also the single best thing for a dog that pulls, digs, chews or can't settle — not because it's exercise but because it's the part of the day that dog was missing.

The weather changes the answer

A number that works in April can be dangerous in July, and this is where fixed routines cause real harm.

Heat is the serious one. Dogs cool themselves mainly by panting, which works poorly in humidity, and the flat-faced breeds manage it worst of all. On a warm day the walk moves to early morning and late evening, the pace drops, and the pavement gets the back-of-the-hand test — if you can't hold your hand on it for five seconds, it will burn a dog's pads.

Cold is less dangerous but changes the arithmetic for thin-coated, small, very young and elderly dogs, which lose heat fast and benefit from shorter, brisker outings rather than a long slow one.

And on a day when going out is genuinely a bad idea, mental work substitutes better than people expect. Twenty minutes of scent games indoors will settle a dog that couldn't have its walk, which is a useful thing to know in advance rather than at four o'clock on a hot afternoon.

How to read your own dog

Since no formula fits, read the dog in front of you.

A dog getting enough of the right exercise is calm and settled at home, sleeps well, and isn't destructive, hard to settle or bouncing off the walls. A dog that's restless, chewing, digging, barking, pacing or wild in the house is often telling you it's under-exercised in body, mind or both.

Watch, too, for the opposite in the vulnerable. A puppy, senior or flat-faced dog that's exhausted, sore, limping or overheating is getting too much or the wrong kind, and needs less rather than more.

One useful check that cuts through the guesswork: what does the dog do in the hour after a walk? A dog that eats and then sleeps has had roughly the right amount. A dog that paces, brings you a toy or starts on the furniture hasn't had the part it needed — and nine times out of ten the missing part is mental rather than physical.

Adjust from what you see rather than from a target, build up gradually rather than jumping to long sessions, and weight the mental side heavily, especially for the clever breeds. The right amount is the amount that leaves your particular dog physically satisfied and mentally content — settled at home, keen on the walk, neither frantic nor flattened. Find that, and you've answered the question far better than any number could, and headed off many of the problems, from separation anxiety to destructiveness, that under-exercise quietly feeds.