Beat the El Paso Heat: Understanding & Preventing Heat Stroke

El Paso’s desert climate brings months of triple-digit afternoons, and for dogs and cats, that kind of heat can turn dangerous in a matter of minutes. Heat stroke is one of the most serious warm-weather emergencies veterinarians treat, and because it can progress so quickly, knowing the warning signs before you need them can be the difference between a scare and a tragedy. At TLC Animal Hospital, every summer we remind clients that heat stroke is almost entirely preventable with the right knowledge and a fast response.

What Is Heat Stroke?

Heat stroke is generally defined in the veterinary literature as a non-fever-related rise in core body temperature above roughly 105.8°F (41°C), occurring when an animal’s body absorbs or produces more heat than it can release through panting and other cooling mechanisms (1). Veterinary reviews typically separate heat-related illness into two categories: “classic” heat stroke, caused by passive exposure to a hot environment such as a parked car or a yard without shade, and “exertional” heat stroke, triggered by physical activity in hot or humid conditions (2). Both forms can escalate within a short window from mild overheating to a life-threatening emergency.

Why Dogs and Cats Overheat So Easily

Dogs and cats have only a limited number of sweat glands, concentrated in their paw pads, and rely mainly on panting to release body heat. When ambient temperature and humidity climb, as they do across El Paso from late spring through early fall, panting alone becomes far less effective. As core temperature rises, the body’s normal compensatory responses start to break down: blood is redirected toward the skin in an attempt to release heat, which can drop blood pressure, while the heat itself begins to damage tissue at the cellular level. Researchers studying canine heat stroke have described this cascade as functioning much like sepsis, with widespread inflammation and a sharply increased risk of abnormal blood clotting (3).

Which Pets Are at Greatest Risk

Large-scale veterinary practice data, including the UK’s VetCompass research program, has identified consistent risk factors for heat-related illness in dogs:

• Brachycephalic (short-muzzled) breeds such as Bulldogs, French Bulldogs, Pugs, and Chow Chows, whose airway structure limits effective panting (4)
• Dogs heavier than 50 kg (110 lb), or above their breed’s typical bodyweight (i.e. overweight animals) (4)
• Dogs under 2 years old, more often linked to exertional heat stroke from high activity levels, and dogs over 12, more often linked to environmental heat stroke from reduced ability to regulate body temperature (5)
• Dogs unable to escape a heat source — for example, confined in a parked vehicle or a yard without shade — face a higher risk of severe or fatal outcomes than dogs that overheat during exercise, where escape and rest are usually possible (5)

In El Paso’s climate, these risk factors are worth taking seriously for most of the year, not just during the hottest weeks of summer.

Heat Stroke in Cats: Easy to Overlook

Cats are generally more cautious around heat than dogs — they seek shade, reduce activity, and rarely exercise themselves into trouble. But surveillance research drawn from UK veterinary practices found that heat-related illness can affect any companion animal species, and specifically cautioned that the common assumption that heat stroke is “a dog problem” leaves feline cases under-recognized and under-reported (6).

Most published feline cases involve confinement — cats trapped in parked cars, sunrooms, or, in one case series, inside running clothes dryers, where prolonged exposure to a hot, enclosed space overwhelmed the cat’s ability to cool down (7). Indoor cats with limited access to water, senior cats, and cats with underlying heart, respiratory, or kidney disease are also more vulnerable once heat stroke begins.

Recognizing the Warning Signs

Heat stroke can progress quickly, so it’s worth recognizing the signs at every stage rather than waiting for the most severe symptoms to appear.

Acute collapse, rapid breathing, spontaneous bleeding, and altered mental status (disorientation, stupor, or seizures) are among the most consistently reported signs in dogs with confirmed heat stroke, and the same red-flag signs apply to cats (3).

First Aid: “Cool First, Transport Second”

Best-practice guidelines published in the Journal of Veterinary Emergency and Critical Care recommend a “cool first, transport second” approach: begin active cooling immediately, before and during the drive to the veterinary hospital, rather than waiting until arrival (8). If you suspect heat stroke in your dog or cat:

• Move your pet out of the heat right away — into shade, an air-conditioned car, or indoors.
• Apply cool or cold water directly to the fur and skin, focusing on the neck, armpits, belly, and paw pads, and pair it with airflow from a fan, open window, or air-conditioning vent. Combining water with airflow cools an overheated pet faster than water alone (9).
• Avoid covering your pet with wet towels — trapped air under a towel can actually insulate heat in rather than releasing it.
• Offer small amounts of cool water if your pet is alert enough to drink on their own; never force water into the mouth.
• Call TLC Animal Hospital or the nearest emergency clinic while you cool your pet so our team can prepare for your arrival, and keep cooling efforts going on the drive over.

This step matters more than many owners realize: one published review of UK veterinary records found that fewer than one in four dogs presenting with heat-related illness had received any active cooling before arriving at the clinic, despite delayed cooling being linked to worse outcomes (9).

Note: It is important not to over-cool the pet and induce hypothermia. Once their rectal temperature reaches 103.5°F, stop cooling measures and maintain the pet at a comfortable room temperature.

What to Expect at TLC Animal Hospital

When you arrive, our team will immediately check rectal temperature, heart rate, and breathing, and continue controlled active cooling so your pet’s temperature comes down safely rather than too quickly. Bloodwork is used to screen for the complications most often associated with heat stroke, including dehydration, elevated liver enzymes, electrolyte imbalances, prolonged clotting times, kidney injury, and low blood sugar (1).

In more severe cases, heat stroke can progress to muscle breakdown, acute kidney injury, respiratory distress, abnormal blood clotting, and sepsis. Even with prompt, appropriate treatment, published case series report mortality rates near 50% in dogs with confirmed heat stroke, which is exactly why speed matters so much both at home and in the clinic (3). Treatment typically includes IV fluids, oxygen support, and close monitoring for at least 24–48 hours, since some complications only become apparent after body temperature has already normalized.

Preventing Heat Stroke in El Paso’s Climate

• Walk dogs in the early morning or after sunset — pavement and sand can reach paw-burning, body-heating temperatures well before noon in summer. Do not walk your pet unless you can keep your bare hand on sun-facing sidewalk comfortably for at least 1 minute.
• Never leave a pet in a parked vehicle, even briefly or with the windows cracked.
• Provide shade and unlimited fresh water for any pet spending time outdoors, and check that water bowls aren’t sitting in direct sun.
• Take extra precautions with vulnerable pets — brachycephalic breeds, senior pets, overweight pets, and pets with heart, lung, or airway conditions require shorter, slower outings on hot days. Some severely affected pets should never be exposed to excessive heat for more than a couple of minutes at a time for a potty break.
• Watch indoor cats closely during heat waves or air-conditioning outages, and never let a cat near an open clothes dryer.
• Build up exercise tolerance gradually rather than starting a hot-weather routine at full intensity — young, fit, active dogs are also commonly affected by exertional heat stroke (10).
• Allow time for acclimation: If moving to a hotter environment, or transitioning an indoor pet into an outdoor pet, allow time for a slow, gradual transition to the temperature change. It can take pets up to 60 days to acclimate to a new temperature range.

The Best Gift You Can Give Your Pet? A Long, Safe Life.

Comprehensive health planning is built on active prevention. Along with proper diet, exercise, seasonal modifications, heat protection, and a loving family, you and your veterinarian can help your pet live a long, healthy life. Discuss seasonal health adjustments and cooling options with your veterinarian.

Scientific References

1. Veterinary literature consensus definitions on non-fever hyperthermia thresholds and pathophysiology metrics.
2. Standard clinical veterinary reviews regarding classifications of classic vs. exertional heat stroke syndromes.
3. Canine heat stroke acute cascade modeling and systemic inflammatory response syndrome (SIRS) systemic markers.
4. VetCompass Research Program Data; Royal Veterinary College (Brachycephalic and weight-related risk cohort tracking).
5. VetCompass Canine Age Profiling & Environmental Risk Analysis for Heat Related Illness.
6. UK Companion Animal Surveillance Network data regarding under-reported feline heat illness syndromes.
7. Feline Confinement Case Series: Domestic environmental hazard heat stroke tracking metrics.
8. Journal of Veterinary Emergency and Critical Care: Best-practice protocols on pre-hospital active stabilization.
9. UK Veterinary Record Clinical Audits: Pre-arrival cooling metrics and impact on patient mortality outcomes.
10. Exertional heat stroke tracking in performance and young canine demographic studies.

This article is provided for educational purposes and does not replace an in-person veterinary examination. If your pet is showing signs of heat stroke, seek veterinary care immediately.