Every summer, thousands of pets die from heat-related illnesses — most of them preventable. Dogs left in parked cars, pets exercised in the heat of the day, brachycephalic breeds pushed beyond their physical limits — the consequences of heat exposure happen fast and can be irreversible.
Understanding how pets regulate temperature, recognizing the early signs of heat stress, and applying practical prevention strategies ensures your pet remains safe through even the hottest months.
How Pets Regulate Temperature — and Why They’re Vulnerable
Dogs and cats do not sweat through their skin the way humans do. They have a small number of sweat glands in their paw pads, but these contribute minimally to heat dissipation. Their primary cooling mechanism is panting — evaporating moisture from the respiratory tract and tongue. This mechanism is significantly less efficient than human sweating, making dogs and cats much more vulnerable to heat than humans in the same conditions.
Several factors further compromise heat tolerance:
Brachycephalic breeds: Flat-faced dogs (Bulldogs, Pugs, French Bulldogs, Boxers) and cats (Persians) have anatomical airway restrictions that significantly impair panting efficiency — the primary cooling mechanism. In hot weather, these breeds are at dramatically higher risk of heatstroke at temperatures that a healthy Labrador would tolerate comfortably. They require special management in summer.
Obesity: Overweight pets have more insulating fat and work harder physically, generating more heat. Obesity significantly increases heatstroke risk.
Age: Puppies, kittens, and senior animals have less efficient temperature regulation.
Dark-colored coats: Absorb more radiant heat than light-colored coats.
Thick double coats: Contrary to common belief, double-coated breeds should generally NOT be shaved — the coat also provides insulation against heat. Shaving can actually make them hotter by removing the insulating air layer and exposing skin to direct radiant heat.
Health conditions: Cardiovascular disease, respiratory disease, and conditions causing weakness all increase heatstroke risk.
Heatstroke: Recognizing and Responding
Heatstroke (hyperthermia) begins when a pet’s core body temperature rises above approximately 104°F (40°C) and becomes a critical emergency above 106°F (41°C). At these temperatures, cellular damage begins throughout the body — the brain, kidneys, and cardiovascular system are particularly vulnerable, and damage can be permanent or fatal even with treatment.
Early signs of heat stress (act now to prevent heatstroke):
- Excessive panting, more labored than normal
- Heavy drooling
- Seeking shade or lying on cool surfaces
- Reluctance to continue exercise
- Mildly elevated body temperature
Signs of heatstroke (emergency — seek veterinary care immediately):
- Very rapid, labored breathing
- Bright red or pale gums
- Excessive salivation
- Vomiting or diarrhea
- Weakness, staggering
- Confusion or disorientation
- Seizures
- Collapse or loss of consciousness
Emergency First Aid for Heatstroke
If you suspect heatstroke, acting in the minutes before reaching veterinary care matters enormously.
- Move the pet immediately to a cool, shaded environment or air conditioning.
- Apply cool (not cold or iced) water to the pet’s body — particularly the paw pads, armpits, and groin where blood vessels are close to the surface. Use a fan to increase evaporative cooling.
- Do not use ice water or ice — rapid cooling causes peripheral vasoconstriction that prevents the cooled blood from reaching the core and can cause shock.
- Offer small amounts of cool water to drink if the pet is conscious and able to swallow.
- Transport to emergency veterinary care immediately — do not wait to see if they improve.
Heatstroke must be treated by a veterinarian even if the pet appears to recover at home — internal organ damage may not be immediately apparent.
The Parked Car Rule
There is no safe temperature for leaving a pet in a parked car. On a 70°F (21°C) day, the interior of a parked car with windows cracked reaches 89°F (32°C) within 10 minutes and 104°F (40°C) within 30 minutes. On an 85°F (29°C) day, it reaches 104°F within 10 minutes.
There is no exception to this rule. “Just a few minutes” is not safe. “Windows cracked” is not safe. If you cannot bring your pet with you when you leave the car, leave them at home.
Practical Summer Safety Strategies
Exercise timing: In hot weather, walk dogs in the early morning or evening when temperatures are lowest. Avoid the hottest hours (typically 10am–4pm). Test asphalt temperature before walks — place your hand on the pavement for 7 seconds. If it’s too hot for your hand, it’s too hot for your dog’s paws.
Provide constant access to cool, fresh water: Check water bowls multiple times daily in hot weather and add ice cubes to keep water cool longer. Consider a pet water fountain to encourage drinking.
Shade and shelter: Ensure outdoor pets always have access to shade. A dog house in direct sun provides no cooling benefit — it actually traps heat. Shade from trees or shade cloth is effective.
Cooling products: Cooling mats, cooling vests, and small splash pools provide effective heat relief for dogs. Wet a bandana and place around the neck for a quick cooling measure.
Indoor cats in hot weather: Ensure air conditioning or fans are running. Provide cool water and cool surfaces to lie on. Cats often seek out cool tiled floors or cool sinks — allow and encourage this.
Signs of hot pavement: Dogs in extreme heat may hold up paws, walk hesitantly, or try to return home — these are signs the ground is too hot. Paw pad burns occur rapidly on very hot surfaces.
High-risk pets: Know if your pet is in a high-risk category (brachycephalic, overweight, senior, dark-coated) and apply extra caution. Consider booties for hot pavement. Keep exercise minimal during heat waves.
→ Read Next: How to Know If Your Pet Is Sick — 15 Warning Signs Every Owner Should RecognizeThe Bottom Line
Heat-related illness in pets is almost entirely preventable with awareness and appropriate management. Know your pet’s risk factors, never leave them in a parked car, exercise during cooler hours, ensure constant access to cool water and shade, and recognize the early signs of heat stress before they escalate to heatstroke. The summer can be enjoyed safely by pets and their owners — with the right precautions consistently applied.
Emma Hartwell is a lifelong animal lover, certified pet nutritionist, and experienced dog trainer with over 8 years of hands-on experience working with animals of all kinds. She founded InnerzNews to give pet owners access to honest, practical, and science-backed advice — because every animal deserves the best possible care. When she’s not writing, Emma is hiking with her two rescue dogs, Milo and Biscuit, or volunteering at her local animal shelter.