Three quarters of the heatstroke cases UK vets see are not dogs shut in cars. According to Royal Veterinary College research covering more than 900,000 UK dogs, 74% of cases were triggered by exertion, and most of those were dogs simply out on a walk in warm weather. Around 14% of affected dogs died.
That statistic changed how we walk Rosie. It also means dog heat stroke treatment is something every owner should already know, not something to look up one-handed whilst your dog is struggling on a pavement.
The good news is that the first few minutes are the ones that count, and they happen before you reach a vet. Below is what to look for, exactly what to do, and a few risks (including one hiding on your dog's chest right now) that most summer safety advice skips over.
Spotting It Before It Becomes an Emergency
A healthy dog sits between 38 and 39°C. Once they climb past 40°C, they're in trouble, and things escalate quickly from there.
Watch for these, roughly in order of severity:
- Heavy, frantic panting that doesn't settle when your dog stops moving
- Thick, ropey drool instead of normal saliva
- Bright red or unusually dark gums and tongue
- Wobbliness, lagging behind, or lying down and refusing to get up
- Vomiting or diarrhoea, especially with any blood in it
- Confusion, seizures, or collapse
The early signs are the useful ones. A dog who has stopped panting effectively and gone quiet is not calming down, they're deteriorating. If your dog looks off in the heat, act on the mild signs rather than waiting for confirmation.
Dog Heat Stroke Treatment: Cool First, Transport Second
UK vets and the RSPCA are unanimous on the order of operations, and it's counterintuitive: cool your dog down before you drive anywhere. Time spent in a warm car whilst untreated is time your dog's body temperature keeps climbing.
Here's the sequence:
- Stop everything. No more walking, no encouraging them along to the car. Get them into shade or a cool room.
- Pour cool water over them. Neck, chest, belly, and inner thighs. Keep going. If there's a paddling pool, a stream, or a hosepipe, use it and submerge the body.
- Avoid their head. Water over the face and nose makes breathing harder, which is the last thing a struggling dog needs.
- Get air moving. Fan them, open doors, use a car fan on cold. Evaporation is what actually shifts heat out of the body.
- Skip the damp towel draped over them. This one surprises people. The RSPCA specifically warns against laying wet towels over a dog's body, because a flat sheet of fabric against the skin traps heat instead of releasing it. Ice packs tucked between the thighs are fine. A blanket over the back is not.
- Offer small drinks of cool water if they're conscious and willing. Never force it.
- Then call your vet and go. Ring ahead so they're ready, and keep the car ventilated or air-conditioned on the way.
One old myth worth binning: cold water does not send an overheating dog into shock. The RSPCA is direct about it, saying dousing or immersing an overheated dog in cold water is vital to their recovery. Cool water, fast, is the treatment.
And to state the obvious, heatstroke is a genuine veterinary emergency every single time. Even a dog who perks up on the driveway needs checking over, because the internal damage isn't always visible. If in doubt, your vet is the right call.
The Harness Problem Nobody Talks About
Here's the bit that rarely makes it into summer safety lists. A harness sits directly across your dog's chest and armpits, which happens to be one of the areas they rely on to lose heat. Thick neoprene, padded nylon, fleece linings, and solid vest-style panels all hold warmth against the skin and block airflow exactly where you don't want it blocked. On a 24°C afternoon, a heavily padded harness is a body warmer.
That doesn't mean going back to walking on a collar. Pressure on the throat is worse again for a dog who needs to pant freely, which is why vets at the PDSA recommend harnesses over collars in the first place. The answer is the material, not the format.
Breathable mesh is the best choice by a comfortable margin. Air passes straight through the panels rather than sitting trapped between fabric and fur, so heat escapes as your dog moves. Our mesh harnesses were built around that principle, with open weave panels across the chest and a lightweight build that doesn't add insulation to a dog who's already working hard or even better our step in harnesses, which do not cover the vital chest area.
Two practical habits on top of that:
- Wet the mesh before you set off. A damp, open-weave harness with air passing through it cools by evaporation as your dog walks. This works because the weave breathes, and it's a prevention tactic for a warm walk, not a treatment. Re-wet it if you're out for a while.
- Take the harness off the moment you suspect trouble. During actual dog heat stroke treatment, everything comes off. Bare skin and cool running water beat any fabric, wet or dry.
For hot weather walks where you want minimal kit against your dog's body, a slip lead does the job on its own. The Freedom Pro Slip Lead gives you two ways to walk from one lead, with a no-kink swivel handle and a metal safety stopper, and nothing sitting across the chest at all.
Other Risks Worth Knowing (And What to Do About Them)
Heatstroke rarely has a single cause. It's usually two or three small things stacking up on the same afternoon.
Hot pavement. Tarmac holds heat long after the air cools. Press the back of your hand to the ground for seven seconds. If you want to move it, your dog does too. Grass routes and shaded paths, or walk before 8am and after 8pm.
Flat-faced breeds. British Bulldogs are roughly 14 times more likely to develop heatstroke than Labradors, and French Bulldogs, Pugs, Boxers and Cavaliers all carry raised risk. Shorter, slower, earlier walks, and no "just to the end of the road" in the middle of the day.
Weight and coat. Overweight dogs, long-coated dogs, giant breeds, puppies and seniors all struggle more. A summer trim and a sensible feeding routine both take pressure off. Ask your vet before clipping a double coat, because with some breeds it does more harm than good.
Water and pacing. Carry water and offer it every 15 minutes rather than once at the end, and let your dog set the pace. A dog chasing a ball will keep going well past the point their body is coping. Our dog walk calculator is a useful sanity check on how much your dog actually needs, because more is not automatically better in July.
The car. Even parked in shade with the windows cracked, a car becomes an oven within minutes. There is no safe version of this one.
Keeping Your Pack Cool This Summer
Most heatstroke cases in this country come from ordinary walks with the best of intentions, which means most of them are avoidable with small changes: earlier starts, a breathable harness, water in the bag, and the confidence to turn back early. Knowing the cooling sequence by heart is the bit that matters when it counts.
Cool walks, early starts, and a very happy dog at the end of them. That's the whole plan.
