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Is it too hot to walk your dog right now?

No single temperature is safe for every dog. The bands veterinary sources publish, what moves them, and what a forecast cannot tell you.

By Derek Ang, founder of PawPrint · Updated

Quick answer

There is no single temperature that is safe for every dog. Published veterinary guidance for temperate climates treats roughly 24°C as the start of high risk for the dogs most vulnerable to heat, and 28°C and above as dangerous for all dogs. Those bands assume shade, water and a short, flat walk. Your dog's breed, age, weight and coat move them, and humidity, direct sun and hot ground move them again. The most useful check is not the forecast: it is the ground under your hand and your dog's breathing in the first five minutes.

Why one number can never be the answer

Air temperature is the number everyone has, which is why everyone quotes it. It is also the number that leaves the most out.

A dog cools itself mainly by panting. That is evaporative cooling, and it gets less effective as humidity rises — so 28°C in humid air is a harder afternoon than 28°C in dry air, with the same reading on the same thermometer. Direct sun adds radiant load the air temperature does not see. The ground adds a separate problem entirely, because your dog walks on it barefoot and you do not.

Then there is the dog, and this is where a single threshold falls apart completely.

Breed. In a Royal Veterinary College study of more than 900,000 UK dogs, flat-faced breeds had about twice the odds of heat-related illness. A short muzzle is a smaller radiator: panting is how a dog dumps heat, and a brachycephalic airway moves less air for the same effort. Coat type and body mass push in the same direction — a thick-coated northern breed and a lean short-haired one are not having the same afternoon.

A number that is fine for a three-year-old whippet is therefore not automatically fine for the bulldog standing beside it on the same pavement, in the same weather, on the same walk.

Age. This one carries the most weight and gets the least attention. In a Royal Veterinary College study of 856 heat-related illness events, dogs aged 12 years and over had about nine times the odds of a fatal outcome as dogs under two. An older dog is not simply slower in the heat; if something does go wrong, it goes wrong far more seriously.

The bands, and where they come from

For temperate and continental climates, the bands most often published by veterinary sources run roughly like this: 20–23°C is moderate risk; 24–27°C is high risk for a lot of dogs — skip it, or keep it very short and gentle; 28°C and above is dangerous for all dogs.

The Tufts Animal Care and Condition weather-safety scale agrees on the direction rather than the exact numbers, and adds something the simple bands do not: it applies a modifier for a flat-faced dog, which moves that dog into the dangerous zone several degrees earlier than a long-nosed one of the same size. That is the important structural point. The risk bands are not one ladder everyone climbs together; they are a different ladder per dog.

For tropical and arid climates the honest position is that no authority publishes an equivalent dog-walking band. Heat is a constant rather than an event in those places, dogs living there are acclimatised in ways the temperate research does not measure, and applying a British 24°C threshold literally would mean telling people to stay indoors all year. Where we set higher bands for those climates, they are our own judgement and not a citation — and a threshold nobody can trace is a number somebody made up, so we say which is which.

Check the ground, not just the air

The air can be pleasant while the surface your dog walks on is not. Asphalt has been measured at around 52°C when the air is only 25°C, and it is hot enough to burn paw pads. That measurement is Berens, reported by Washington State University, and it is the reason the air reading and the ground reading are two different questions.

The field test costs almost nothing. Press the back of your hand on the pavement for 7 seconds, the convention described by Washington State University. Do it on the surface you are actually about to walk on, in the sun, not on the shaded step outside your door — and do it again in the evening, because asphalt releases heat for hours after the air has cooled.

What to watch in the first five minutes

Heat-related illness in dogs develops faster than most owners expect, and the early signs are easy to read as ordinary enthusiasm.

Watch for panting that gets heavier rather than settling once you have found shade; a dog that slows, lags or wants to lie down; drooling that is thicker or more copious than usual; gums that look very red or very pale; unsteadiness. A body temperature above 39.4°C is abnormal for a dog, according to VCA Animal Hospitals — heatstroke is a genuine emergency, and a thermometer reading is not a diagnosis.

If you see those signs, stop walking. Move into shade, offer water, wet the coat with cool — not ice-cold — water, and contact a vet. Do not finish the route because you are nearly home.

Exertion is the variable you control

One thing worth separating: most of the risk in a warm-weather walk comes from what the dog is doing, not from standing still in the sun. Running, fetch, a hill, an excited dog pulling on the lead — all of it generates internal heat on top of the environmental load, at the moment the dog's cooling system is least effective.

That means the decision is rarely a binary walk-or-don't. A short, flat, shaded walk at a pace the dog sets is a genuinely different activity from a half-hour of fetch, and the temperature at which each becomes a bad idea is different too.

What a forecast cannot tell you

A forecast gives you air temperature, and sometimes humidity and UV. It does not know your dog's breed, age or weight. It does not know whether your route is shaded or open, asphalt or grass, flat or steep. It does not know that the last three hundred metres home have no shade at all.

So treat any tool — PawPrint included — as something that narrows the question rather than answers it. The forecast tells you whether this is an obvious no, an obvious yes, or a judgement call. On a judgement call, the hand on the pavement and the dog's breathing in the first five minutes are better evidence than any number on a screen.

Sources

On the bands above. The temperate figures are reported from veterinary guidance rather than read by us in the primary publication, and the Tufts scale’s band readings are a graphical chart read by eye; its brachycephalic modifier is verified from the PDF. Where we say a number is our own judgement, it is.

Common questions

Is 24 degrees too hot to walk a dog?

For a flat-faced, senior, overweight or thick-coated dog, 24°C is the point where published veterinary guidance starts calling the risk high — so keep it very short and gentle, or wait. For a young, fit, thin-coated dog in temperate weather it is usually fine with shade and water. The number is a threshold for the dog most at risk, not for every dog.

What temperature is actually dangerous for dogs?

Veterinary guidance for temperate climates treats 28°C and above as dangerous for all dogs, and 24-27°C as high risk for many. Those bands assume shade, water and a short flat walk. Add sun, humidity, hot ground or a hill and the effective risk is higher than the thermometer suggests.

Can I walk my dog in the evening instead?

Usually yes, and it is the single most reliable fix. Air temperature falls after sunset and so does ground temperature, though asphalt holds heat for hours longer than the air does — so check the ground with your hand even after dark.

Does humidity matter as much as temperature?

It matters a great deal. Dogs shed heat mainly by panting, which is evaporative, and evaporation slows as humidity rises. A humid 28°C day is harder on a dog than a dry 28°C day, which is why a single air-temperature number can never be the whole answer.

How this page was made

Prepared for PawPrint with AI assistance. Updated . Editorial review by Derek Ang has not yet been recorded. Sources are linked so you can check the guidance and its limits. This guide is general information; it does not replace advice from your vet or the relevant authority.