On a hot afternoon, a person can sweat through a shirt, wipe their forehead, and feel relief as the breeze does its work. A dog has no such whole-body cooling system. That is why a sunny walk, backyard play session, or short wait in a parked car can become dangerous much faster for dogs than many owners expect. Understanding how dogs release body heat is one of the simplest ways to prevent heat exhaustion and heatstroke.

Dogs do sweat, but only a little. Their most useful sweat glands for cooling are in their paw pads, which is why a hot or nervous dog may leave damp paw prints on a floor. These glands help, but they cannot cool the body the way human sweat glands do. Dogs are covered in fur, and sweat trapped under a coat would not evaporate efficiently. Instead, dogs rely mainly on panting. As a dog pants, moisture evaporates from the tongue, mouth, nasal passages, and upper airways, carrying heat away from the body. Blood vessels in the face and ears can also widen, bringing warm blood closer to the surface so heat can dissipate.

That system is clever, but limited. Panting works best when air can move freely and evaporation can happen quickly. High humidity slows evaporation. Poor ventilation traps heat. Hard exercise produces internal heat faster than a dog can dump it. Flat-faced breeds such as bulldogs, pugs, Boston terriers, and boxers are at greater risk because their airways make panting less efficient. Puppies, senior dogs, overweight dogs, thick-coated or dark-coated dogs, and dogs with heart or breathing problems also need extra caution.

How Hot Is Too Hot?
There is no single “safe” outdoor temperature for every dog, because risk depends on humidity, sun exposure, shade, wind, pavement temperature, fitness, breed, age, coat, and activity level. Still, a useful rule is to become cautious once the air temperature rises above 80 degrees Fahrenheit, especially if humidity is high. At that point, shorten walks, move exercise to early morning or evening, and watch closely for signs of stress. Around 85 to 90 degrees, many dogs should be limited to brief bathroom breaks and quiet time in the shade. At 90 degrees and above, strenuous activity is unsafe for most dogs, and high-risk dogs may need to stay indoors except for quick necessities.

Always consider the heat index, not just the thermometer. Humid 78 degree weather can be harder on a dog than a dry 82 degree day. Direct sun also matters: a shaded path can be comfortable while nearby asphalt is dangerously hot. Before walking, place the back of your hand on the pavement for several seconds. If it is too hot for your skin, it is too hot for paw pads. Choose grass, dirt, or shaded routes, and carry water for both you and your dog.

A parked car is never a safe place to leave a dog in warm weather. Interior temperatures can rise quickly even when the windows are cracked or the car is in the shade. If your destination does not allow dogs to come inside, leave your dog at home.

Signs a Dog Is Overheating
Early warning signs include heavy or frantic panting, excessive drooling, restlessness, slowing down, seeking shade, refusing to continue, or appearing unusually anxious. As overheating worsens, a dog may develop sticky or thick saliva, bright red or pale gums, weakness, stumbling, vomiting, diarrhea, confusion, collapse, or seizures. These signs can progress quickly. A normal dog’s body temperature is roughly 100.5 to 102.5 degrees Fahrenheit. Temperatures above normal are concerning, and heatstroke is often associated with dangerously high temperatures that can damage organs.

How to Help an Overheated Dog Cool Down

If you think your dog is overheating, act immediately. Stop activity and move the dog to shade, air cond itioning, or the coolest available area. Offer small amounts of cool water, but do not force drinking. Begin cooling with cool (not ice-cold) water. Wet the paws, belly, groin, armpits, neck, and head, and use a fan or moving air to help evaporation. If you are near a safe water source, allowing the dog to stand in shallow cool water or voluntarily dip the head can help. Continue cooling while contacting a veterinarian or emergency animal hospital for instructions if you see any of the more serious symptoms listed above.

Avoid ice baths, very cold water, or wrapping the dog in wet towels for long periods. Extreme cold can constrict blood vessels and interfere with heat release, while wet coverings can trap warmth if they block airflow. Do not assume a dog is fine just because panting slows. Heat illness can cause internal damage, and dogs that show collapse, confusion, vomiting, diarrhea, abnormal gum color, seizures, or severe weakness need emergency veterinary care.

Prevention is easier than treatment. Schedule walks during cooler hours, choose shaded routes, keep outings shorter in humid weather, bring water, and take frequent breaks. Provide outdoor dogs with constant shade, fresh water, and airflow; a doghouse can trap heat and should not be the only shelter on hot days. Indoors, fans, cooling mats, tiled floors, closed curtains, and access to air-conditioned spaces can help. Grooming can remove loose undercoat, but avoid shaving double-coated breeds without veterinary guidance because their coats help insulate against both cold and heat.

The best heat-safety habit is to watch the dog in front of you. If your dog is panting harder than usual, slowing down, searching for shade, or acting unlike themselves, end the outing. Dogs love being included in summer life, but they depend on people to know when fun has become too hot. A cooler walk, a shaded rest, or a day indoors can prevent a medical emergency and keep the season safe for everyone at the end of the leash.