Heat and pavement safety for dogs in Phoenix and Scottsdale

Most heat advice for dog owners is written for places with an actual winter, where summer is a few weeks of caution. That advice does not survive contact with a Phoenix or Scottsdale July. What follows is the local version: what the pavement actually reaches, what a parked car actually does, what heatstroke looks like, and which dogs are least able to cope with any of it.

If your dog is showing signs of heatstroke right now

This is an emergency. Do this immediately, then get in the car:

1. Wet your dog down with cool water — a hose, a wet towel, whatever is fastest.
2. Get in the car and point the air conditioning directly at your dog while someone drives you to the nearest emergency vet.
3. Don’t wait to see if it passes. Heatstroke can cause organ damage or death, and it needs immediate, intensive veterinary care (Cornell University Riney Canine Health Center).

Signs of heatstroke: heavy panting, drooling, vomiting, diarrhoea (sometimes bloody in severe cases), weakness, collapse, confusion and seizures (Cornell). A normal dog’s body temperature runs 100.5–102.5°F; heatstroke is defined as 105°F or higher (Cornell).

Can it wait until morning?

If your dog seems tired or a little slow after a hot-weather walk, but is alert, drinking water and acting mostly normal, keep them cool and indoors and watch closely. If anything on the list above shows up, that changes to an emergency immediately.

What about a limping dog after a walk?

Mild limping or paw-licking after walking on hot pavement, without visible blistering or severe pain, can usually wait for a regular vet visit. If a paw pad looks blistered, is bleeding, or your dog will not put weight on it at all, treat it like any other painful injury and call your vet the same day.

Planning ahead

If you have a brachycephalic breed, a senior dog or another higher-risk pet, a summer safety plan is worth having before the heat is at its worst rather than during it. The risk factors are below.

Phoenix heat is not generic hot weather

This is not a “be careful in summer” page. The numbers here are specific to this city, because generic heat advice does not capture what a Phoenix or Scottsdale summer is.

In July 2023, Phoenix averaged 102.5°F for the entire month against a normal of 95.5°F. The city recorded a 33-consecutive-day streak of 110°F or higher, from June 30 to July 29, including three days that hit 119°F. Phoenix became the first major U.S. city to average over 100°F for an entire month. The National Weather Service issued 42 Excessive Heat Warning days that year, including 29 consecutive days in July alone (Fox Weather).

For context on how seriously this heat is taken locally: Maricopa County recorded 645 heat-associated human deaths in 2023, up from 425 the year before — the seventh consecutive year of record-setting heat deaths, with 71% of those deaths occurring on days under an active Excessive Heat Warning (Fox Weather). To be clear, that figure is about human deaths, not pets — no pet mortality data was available in that source — but it is real evidence that “it’s just hot” undersells what this city’s summer actually is.

Pavement is hotter than you think, and burns fast

Surface temperatures can run 40–60°F hotter than the air temperature. On an 86°F air-temperature day, a mild day by Phoenix standards, asphalt can reach 135°F, hot enough to burn a dog’s paws in 60 seconds (AAHA).

The test: press the back of your hand to the pavement and hold it there for 7 seconds. If you cannot keep your hand down the whole time, it is too hot for your dog’s paws (AAHA).

It is not just asphalt. Concrete, sand, metal and artificial turf all get dangerously hot in direct sun (AAHA). A backyard putting green or a pool deck can be just as risky as a sidewalk, which is worth knowing if you assume the danger stops at your own gate.

Safe walking windows: early morning and late evening. Avoid midday, when the sun is at peak intensity (AAHA). In a Phoenix summer, that is not a nice-to-have. For most of the season it is close to the only safe option.

Who is at higher risk

• Brachycephalic (short-muzzled) breeds like pugs and bulldogs
• Senior dogs
• Overweight dogs
• Thick-coated or dark-coated dogs
• Dogs with existing respiratory or cardiac disease

(Cornell)

If your dog fits any of these, the safe-walking-window guidance above matters more rather than less, and a check-in before the worst of the heat arrives is worth having.

The hot car numbers, because “just a minute” is not a minute

A parked car heats up fast, and the American Veterinary Medical Association has the actual numbers:

• +19°F after 10 minutes
• +29°F after 20 minutes
• +34°F after 30 minutes
• +43°F after 60 minutes
• +45–50°F over 1–2 hours
• +50–55°F over 2–4 hours

(AVMA, Pet Safety in Vehicles)

Here is the part most people do not expect: the rate of temperature rise is basically the same whether it is 70°F or 110°F outside. A “mild” 70°F day is not a safe day to leave a dog in the car. After just one hour, the interior can already be more than 40°F hotter than outside, easily exceeding 110°F. Cracking the windows does not meaningfully change this (AVMA).

There is no safe number of minutes to quote here, and this page is not going to invent one. TKresearch whether any veterinary source attaches a specific "minutes until fatal" figure for a dog left in a hot car. None was found — only the temperature-rise data above, which makes the point on its own. Confirm this stays out rather than being estimated

Cold weather note, since this matters twice a year here too: a parked car is not much safer on a cold day either. Young, elderly, ill or thin animals are particularly at risk in cold parked cars as well (AVMA).