Is it too hot to walk my dog?

The usual advice is the seven-second test: press the back of your hand to the pavement, and if you can't hold it for seven seconds, it's too hot for paws. It's a good instinct. The problem is that it only works if you're already standing on the pavement — and by then you've made the decision.

The number that actually matters isn't the air temperature. It's the temperature of the ground.

Asphalt runs far hotter than the air

Dark asphalt absorbs most of the sunlight that hits it and re-radiates it as heat. In full sun it routinely sits 40–60 °F hotter than the air around it. That gap is why a walk that feels fine to you can be painful for a dog:

Those pairings come from Berens (1970), the burn-injury study most often cited for this, and they line up with what our own surface model produces. A concrete sidewalk runs cooler than asphalt — lighter, more reflective — which is why the shaded or paler side of a street is a genuinely different walk.

Why paws burn faster than you'd expect

Skin damage isn't only about how hot a surface is; it's how hot for how long. Moritz and Henriques (1947) established the relationship still used today: at around 125 °F, contact for roughly a minute is enough to cause a burn. Hotter surfaces need far less. At 150 °F it's seconds.

A dog on a walk isn't making brief contact. Paws are in continuous contact with the ground for the whole walk, and a dog will often keep going well past the point of discomfort because it's following you.

What to actually check

WetBulbTracker's paw safety check estimates the ground temperature directly, rather than asking you to infer it from the air:

• OK — comfortable for a normal walk.
• Warm — fine for short walks; favour grass and shade.
• Too hot — keep it brief; stay off asphalt entirely.
• Dangerous — burn risk within about a minute of contact. Grass only, or wait.

Three practical habits that matter more than any single number: walk early or late rather than midday; prefer grass, dirt, and shaded sidewalk over open asphalt; and remember that a dark parking lot is the hottest surface most dogs ever stand on.

The one that catches people out

Pavement does not cool down when the sun goes off it. It holds the heat it absorbed all day and releases it slowly for hours — which is why an evening walk can still be too hot even though the air feels pleasant and the sun is down. That's a big enough surprise to be worth its own explanation: see why pavement stays hot after sunset.

Surface temperatures are modelled estimates, not measurements from a sensor at your location. Treat them as guidance for planning a walk, and use the seven-second test when you're standing there. This is not veterinary advice — if you think your dog has burned its paws or is overheating, contact a vet.