SCIENCE + SAFETY

Why asphalt can burn your dog's paws in seconds

In summer, asphalt can exceed 60°C while the air temperature reads 30°C. Dog paw pads are sensitive to extreme heat. CanAI calculates in real time whether it is safe to go out.

20°C35°C50°C65°C+

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Why is asphalt more dangerous than the air?

Asphalt is a dark material that absorbs solar radiation and retains it for hours. While 30°C air might feel comfortable to you, asphalt can be at 60–70°C. Dog paw pads do not have the same heat resistance as the sole of your shoe. An exposure of just 60 seconds can cause burns.

Source: AVMA (American Veterinary Medical Association) and FCI (Fédération Cynologique Internationale).

How we calculate the asphalt temperature

Our estimate combines three factors using real weather data from Open-Meteo — servers in Switzerland, free and no API key required:

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Air temperature

The baseline. The higher the ambient temperature, the hotter the asphalt. We use air temperature at 2 metres from Open-Meteo.

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UV index (solar radiation)

The most decisive factor in summer. Each UV index point adds ~4.5°C to the asphalt. A clear day with UV 8 adds 36°C on top of the ambient temperature.

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Time of day (solar window)

Between 11:00 and 17:00, the sun is at its highest angle and asphalt accumulates heat. We add 5°C extra when these conditions are met.

= Real example: 30°C air + UV 8 + midday = 30 + 36 + 5 = 71°C on the asphalt.

This is a preventive estimate, not a direct measurement. We err on the safe side: we prefer to warn you early. It does not replace the advice of your vet.

Weather data source: Open-Meteo (open-meteo.com), open-source, servers in Switzerland, GDPR-compliant. Calibrated against FCI/AVMA veterinary studies.

Infographic: how asphalt temperature for dogs is calculated

The 4 risk levels

Each level has a colour, a reference temperature and a concrete recommendation.

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SafeAsphalt < 30°C

Paw pads are fine. You can go out normally.

Enjoy the walk.

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CautionAsphalt 30–45°C

Asphalt is starting to accumulate heat. Low but growing risk.

Short walks. Prefer shade and grass. Frequent hydration.

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High riskAsphalt 45–55°C

Temperature painful for paw pads within minutes.

Avoid asphalt. Choose dirt, grass or shade. Very short walks.

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DangerAsphalt > 55°C

Paw pad burns in under 60 seconds. AVMA/FCI threshold: 52°C/125°F.

Do not walk. Emergency needs only, in shade. Consult your vet if there are injuries.

The 7-second test

Before going out for a walk, press the palm of your hand on the asphalt for 7 seconds. If you cannot hold it, neither can your dog. It is a simple, free and effective test.

The test is a practical guide, not a measuring instrument. It may vary depending on the material and prior sun exposure.

Want to know if it is safe to go out right now?

CanIA calculates the asphalt temperature in your city in real time and warns you before it becomes dangerous.

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