
Heat safety for Southern California dogs
Written by Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer, UrgentPaws
Published August 11, 2026
The short version
- Heatstroke is a true emergency. Stumbling, collapse, vomiting, or bright red gums after heat exposure means a 24-hour ER immediately.
- Flat-faced breeds, seniors, puppies, overweight dogs, and dogs with heart or airway disease overheat at much lower temperatures than others.
- Cool your dog on the way — do not delay leaving in order to cool them fully. Use cool water, never ice.
- A dog can be badly affected on a day that feels merely warm to you, particularly on asphalt or in a parked car.
Some heat signs mean go now: frantic or noisy panting, stumbling, disorientation, vomiting or diarrhea, bright red or brick-colored gums, weakness, or collapse after time in the heat. Heatstroke damages organs quickly and needs a 24-hour ER, not a wait-and-see at home.
Why dogs struggle more than we do
Dogs barely sweat. Cooling happens mainly through panting, which becomes markedly less effective as humidity climbs, and it depends on moving air across moist tissue. A dog in a hot car, a crate with poor airflow, or a sun-exposed yard has very little capacity to shed heat.
Southern California adds a specific hazard: asphalt. Pavement absorbs and holds heat well beyond air temperature, and it is inches from your dog’s face as well as under their feet.
Dogs at higher risk
- Flat-faced breeds — bulldogs, French bulldogs, pugs, boxers, Boston terriers — whose airways make panting far less efficient
- Overweight dogs
- Puppies and senior dogs
- Dogs with heart disease, laryngeal paralysis, or any existing airway condition
- Thick or double-coated breeds bred for cooler climates
- Any dog newly arrived from a cooler region and not yet acclimatized
The practical version
Do the seven-second pavement test
Place the back of your hand on the asphalt. If you cannot hold it comfortably for seven seconds, it is too hot for paws. Walk on grass, or wait.
Move walks to early morning or late evening
Pavement stays hot for hours after the air has cooled. Late evening is usually safer than late afternoon, even at the same air temperature.
Never leave a dog in a parked car
Interior temperature rises fast even with windows cracked, and even on days that feel mild. There is no safe duration.
Bring water and offer shade breaks
Carry water on any warm-weather outing and offer it regularly, rather than waiting for obvious thirst.
If you think your dog is overheating
Move them out of the heat immediately — shade, indoors, or an air-conditioned car
Offer small amounts of cool water if they are alert and able to swallow
Wet them with cool — not ice-cold — water, concentrating on the belly, armpits, and groin
Get air moving over the wet coat with a fan or open windows
Drive to a 24-hour ER, cooling on the way. Do not wait until they look better
A dog who seems to recover after a heat episode can still have internal damage that only becomes apparent hours later, so it is worth being seen even if they perk up. If you are not certain the episode was severe, call us and describe it — that is a conversation worth having before you decide to go to bed.
Dr. Cassie Knapp, DVM
Co-Founder & Chief Medical Officer
Dr. Cassie Knapp is a veterinarian with 17 years of clinical experience and extensive emergency room and urgent care experience. See full bio
