Look for signs of dehydration.
Don’t think endless panting is fine in summer. Heat stroke can be fatal to dogs. They do not have sweat glands like humans and regulate their temperature only by panting. Cats stay cool by using their own saliva and licking their bodies.
Dogs and cats as well as rabbits, guinea pigs and other rodents are prone to heat stroke. If left untreated, this condition can cause serious, possibly irreversible, damage to your pet’s organs.
Signs of heat stroke in dogs include seizures, drowsiness, and delirium-like behavior. Cats may show signs of heat related suffering from excessive grooming, weakness or redness of the tongue. If you notice any of these characteristics in your pet, contact your veterinarian immediately.