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Walk timing and the pavement test
Why there is no magic number
In the UK study, the median maximum daily WBGT on heat-related illness event days was 16.9°C (62°F). WBGT is a heat-stress index combining air temperature, radiant heat, humidity and wind, not an ordinary air temperature or a safety limit. The researchers used the nearest available weather station for each event day. No number or checklist can confirm that a walk is safe. Choose cooler hours, shade, grass and gentle activity; stop if your dog seems unwell. If heat illness is suspected, start cooling and call a vet immediately. Do not delay urgent veterinary care to take a temperature. Among 551 exercise-triggered events with the activity recorded, 372 (67.5%) followed walking. This is a share of recorded illness events, not the risk of an individual walk.
Timing the day
- Early morning is the safest slot. Surfaces have had all night to shed heat; late evening is second best, after the ground cools.
- Mild does not mean risk-free. The UK data says dogs overheat on ordinary spring and autumn days too, especially when the walk turns into a workout. Match intensity to the day, not the calendar.
- When a day feels hot to you, treat the walk as optional. Shorten the loop, slow the pace, carry water, stay on grass and shade - or move play indoors. There is no validated temperature line that makes a walk automatically safe or unsafe, so conditions and your dog decide.
- Hot, humid, still days are the worst combination. Humidity blunts panting - a dog's main cooling system - and still air removes the breeze that helps it work.
The ten-second test
You're wearing shoes; your dog isn't. Place the back of your hand flat on the pavement and hold it for ten seconds. If you can't keep it there comfortably, don't walk your dog on it. A bare foot works the same way, and the same test applies to sand, concrete, metal ute and truck beds, and artificial turf. Test the actual surface you'll walk on, in the sun - not the shaded patch by the door. No published standard sets a universal pavement-temperature cutoff, which is why this physical check, not a number, is the screen that veterinarians and welfare organizations teach. And it is a screen, not a guarantee: a surface that feels merely warm never proves a walk is safe. Dark surfaces in full sun run far hotter than the air above them, and paw pads can burn - when in doubt, choose grass. Australia's Victorian government puts its summer advice plainly: exercise pets in the cool of the day, and don't walk dogs on hot paths or roads.
Dog factors move the line down
Everything above assumes a healthy adult dog. Flat-faced breeds, heavy-coated dogs, puppies, seniors, overweight dogs and dogs with heart or airway disease all overheat sooner - in the UK records, flat-faced dogs had higher odds of every type of heat illness. For them, treat the cool hours as mandatory and read flat-faced breeds and heat. The walk-day checklist turns the sun on the ground and your dog's build into the cautions this research supports.