Everything You Need to Know About Heatstroke in Cats & Dogs

Summer is a time for backyard adventures, hikes, and long days outside, but rising temperatures can quickly become dangerous for our pets. Heatstroke, also called hyperthermia, is a life-threatening emergency that can affect both dogs and cats, sometimes faster than people realize.

Knowing how to recognize the early signs of overheating and what to do if it happens can make all the difference. Acting quickly could save your pet's life.

What is Heatstroke and How Does it Happen?

Heatstroke occurs when a pet's body temperature rises to dangerous levels, and they can no longer cool themselves effectively. A normal body temperature for dogs and cats is higher than ours, typically ranging from 100°F to 102.5°F. Once their temperature rises above normal, especially above 103°F, they should be evaluated promptly. If it continues climbing above 105°F, heatstroke can develop rapidly, putting the brain, heart, kidneys, and other vital organs at risk.

Unlike people, pets don't cool themselves by sweating over most of their bodies. They rely primarily on panting, along with a small amount of sweating through their paw pads. When temperatures are high, humidity is elevated, or exercise is too strenuous, those cooling mechanisms may not be enough.

Why Are Pets More Susceptible Than People?

Our pets are built differently than we are, which makes them more susceptible to overheating.

They:

• Wear a fur coat year-round.
• Have very few sweat glands.
• Depend mostly on panting to cool themselves.
• Can absorb heat quickly from hot pavement, direct sunlight, and warm surroundings.

Some pets are at even greater risk, including brachycephalic (short-nosed) breeds like Bulldogs, Pugs, and Persian cats, as well as senior pets, overweight pets, young animals, and those with underlying heart or respiratory disease.

Most importantly, pets don't always show obvious signs of distress right away. By the time they appear seriously ill, heatstroke may already be developing.

Signs of Heatstroke in Dogs and Cats

Heatstroke is a medical emergency that requires immediate veterinary care. Watch for signs including:

• Heavy or excessive panting
• Thick or excessive drooling
• Vomiting or diarrhea
• Bright red gums or tongue
• Restlessness or anxiety
• Weakness or lethargy
• Confusion or disorientation
• Stumbling or uncoordinated movements
• Collapse
• Seizures

Cats often show more subtle signs than dogs. Open-mouth breathing, drooling, weakness, or unusual lethargy in a cat should never be ignored, especially during hot weather.

What Should You Do If Your Pet Shows Signs of Heatstroke?

If you think your pet is overheating, seek veterinary care immediately. As you travel, you can begin cooling your pet safely:

• Apply cool (not cold) water to areas with less fur, such as the belly, armpits, groin, paw pads, and ear flaps.
• Place a fan near your pet if possible to help increase heat loss.
• Offer small amounts of cool (not cold) water if your pet is alert and able to drink.
• Avoid using ice or ice-cold water. Extremely cold temperatures can cause blood vessels near the skin to constrict, making it harder for the body to release heat. Likewise, don't immerse your pet in a tub or pool of water, as this can trap heat and make cooling less effective.

Even if your pet seems to improve, they still need to be evaluated by a veterinarian. Heatstroke can cause internal damage that isn't immediately visible and may continue to progress after your pet appears better.

Prevention is Key

The good news is that most cases of heatstroke are preventable. Here are a few simple ways to help keep your pet safe:

• Never leave pets in a vehicle. Even on a mild day, the interior of a car can reach 120°F in minutes. Cracking a window or parking in the shade does not help.
• Ensure constant access to water. Refill bowls frequently, and consider adding extra bowls around the home or yard.
• Avoid intense outdoor exercise. Take breaks in shaded areas and offer water often. Early morning or late evening walks are best.
• Protect their paws. Asphalt and concrete can burn paws. If you can’t hold the back of your hand on the pavement for 7 seconds, it’s too hot.
• Stay indoors during peak heat. The hottest part of the day is typically between 10 a.m. and 5 p.m. On especially hot days, indoor play and shorter potty breaks are often the safest choice.

A little extra planning can go a long way in preventing a life-threatening emergency. By recognizing the signs of heatstroke early and taking simple precautions, you can help your pet stay safe, healthy, and comfortable all summer long.