The brain is often among the organs most immediately affected by heat stroke. When a dog’s body temperature rises dangerously high, the brain can swell or malfunction, causing confusion, staggering, seizures, or loss of consciousness. Heat stroke can also severely damage the kidneys, liver, heart, and digestive tract, so there is no single organ that is always affected most.
Heat stroke is a life-threatening emergency. If you suspect your dog is overheating, begin cooling them and contact a veterinarian or emergency veterinary hospital immediately. Do not wait for every symptom to appear.
Excessive heat can injure brain cells and disrupt the systems that control movement, awareness, and breathing. A dog may seem disoriented, have trouble walking, or become unusually weak. In severe cases, seizures or collapse can occur.
Other early warning signs can include heavy panting, excessive drooling, bright red gums, vomiting, and diarrhea. Signs can progress quickly, and a dog can have serious internal damage even after their temperature begins to fall.
The kidneys can be injured by dehydration, reduced blood flow, and the breakdown of muscle tissue. The liver may also be damaged, affecting its ability to process toxins and support normal blood clotting.
Heat can injure the lining of the intestines, allowing bacteria and toxins to enter the bloodstream. It can also strain the heart and contribute to dangerous clotting problems. Because these complications may develop or worsen after initial cooling, veterinary monitoring is essential.
Move your dog into shade or an air-conditioned area. Wet their coat and skin with cool or room-temperature water and use a fan or airflow to help cooling. Avoid ice baths, and do not force your dog to drink. You can offer small amounts of water if they are alert and able to swallow.
Call an emergency veterinarian while you begin cooling, and arrange immediate transport. Continue cooling during the trip as directed by the veterinary team. Even if your dog appears to recover, they still need urgent veterinary assessment for organ damage.
For more warning signs and emergency steps, see our guide to spotting heat stroke in dogs.
Heat stroke can cause lasting brain or organ damage, but permanent changes are not inevitable. In dogs, the outcome depends on the severity of the heat stroke and how quickly cooling and veterinary treatment begin.
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