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Dog Overheating Symptoms

By Dr. James Carter, DVM · Last reviewed: May 2026

Heat stroke kills dogs every summer. Most of the time, it is preventable. Here is what to watch for and what to do.

Emergency signs

If your dog collapses, has seizures, or loses consciousness, call your vet or emergency animal hospital right away. Do not wait.

Symptoms by Severity

Early Warning

  • Heavy panting
  • Drooling more than usual
  • Seeking shade or cool spots
  • Reduced activity

Moderate

  • Thick, rope-like saliva
  • Bright red or pale gums
  • Weakness or stumbling
  • Rapid heartbeat

Emergency

  • Vomiting or diarrhea
  • Confusion or glassy eyes
  • Muscle tremors
  • Loss of consciousness

What to Do Right Now

  1. 1

    Move to a cool spot

    Get your dog out of the sun. Inside with AC or a fan is best. A shaded area is second best.

  2. 2

    Offer cool water

    Let them drink small amounts. Do not force water. Cool water, not ice water.

  3. 3

    Apply cool water to key areas

    Wet a cloth and apply to the paws, neck, and inner thighs. These areas have major blood vessels close to the skin.

  4. 4

    Use a fan

    Airflow speeds cooling. A box fan pointed at a wet dog is very effective.

  5. 5

    Call the vet

    If symptoms do not improve in 10-15 minutes, call immediately. Heat stroke causes organ damage fast.

Prevent Overheating Before It Starts

A cooling mat or elevated bed gives your dog a cool surface on hot days. It is one of the easiest ways to reduce overheating risk at home.

See Best Cooling Beds

Questions

What temperature is dangerous for dogs?

Dogs can overheat in temperatures above 80°F, especially in direct sunlight. Short-nosed breeds like Bulldogs and Pugs are at risk above 75°F. Never leave a dog in a parked car, even for a few minutes. Inside a car on a 70°F day, temperatures can reach 100°F within 20 minutes.

How do I cool down an overheating dog at home?

Move your dog to a cool, shaded area. Offer cool (not ice cold) water to drink. Apply cool water to the paws, groin, and neck with a wet cloth. Use a fan to increase airflow. Do not use ice or very cold water, as rapid temperature changes can cause shock. If symptoms do not improve in 10 minutes, call a vet.

Which dog breeds are most at risk for overheating?

Flat-faced (brachycephalic) breeds are highest risk: Bulldogs, Pugs, French Bulldogs, Boxers, and Shih Tzus. Thick-coated breeds like Huskies and Malamutes also overheat faster. Senior dogs, overweight dogs, and puppies under 6 months are at higher risk than healthy adult dogs.

Can I use a cooling mat to prevent overheating?

Yes. A cooling mat gives your dog a cool surface to rest on and can reduce core body temperature by 5-10 degrees in hot weather. It works best as a preventive measure rather than a treatment for severe overheating. Place it in a shaded area with good airflow for best results.

How long does it take for a dog to overheat?

On a 90 degree day, an active dog can show signs of heat exhaustion within 15 minutes. In a parked car, even with windows cracked, temperatures rise to dangerous levels within 10 minutes. Flat-faced breeds can show symptoms even faster.

What is the difference between heat exhaustion and heat stroke in dogs?

Heat exhaustion is the early stage: heavy panting, drooling, and weakness. It can be reversed with cool water and rest. Heat stroke is the severe stage: body temperature above 104 degrees, confusion, vomiting, or collapse. Heat stroke is a medical emergency requiring veterinary care.

What is a normal body temperature for a dog?

A dog's normal body temperature is 101 to 102.5 degrees Fahrenheit. A temperature of 103 to 104 degrees signals overheating. Anything above 104 is heat stroke and requires emergency vet care. Measure rectally with a pet thermometer for an accurate reading.

How do I keep my dog cool indoors without air conditioning?

Use fans for airflow. Provide a cooling mat or elevated bed. Freeze a water bottle and wrap it in a towel for your dog to lie next to. Close blinds during the hottest part of the day. Offer cool water with a few ice cubes. Keep activity light and indoors during peak heat.

Are some times of day worse for dog overheating?

Yes. The riskiest hours are 11 AM to 4 PM, when sun and air temperature peak. Walk dogs early morning (before 8 AM) or evening (after 7 PM) on hot days. Pavement and sand can reach 140 degrees in summer, which burns paw pads even when air temperature feels comfortable.