Heat exhaustion or heatstroke (more severe form of overheating) occurs when an animal cannot keep its core body temperature within a safe range (above 106°F). Environmental (temperature, humidity, shelter, lack of water), physical (breed, age, weight, exercise), and medical (medications, pre-existing illness) factors contribute to the development of heatstroke. Pets left in warm cars for even a few minutes are at high risk of developing heatstroke. Severity of signs depends on how severely the body temperature is elevated, duration of exposure to adverse conditions, and any pre-existing conditions. Signs may include: restlessness, excessive panting, brick red gums, lethargy, weakness, wobbly gait, vomiting and diarrhea. Progression to blindness, seizures, collapse, coma and death may occur. Treatment must start immediately. Remove the animal from the heat and continuously wet down the animal thoroughly by spraying or pouring cool water over the animal. Make sure there is complete penetration of the hair coat and that the belly and groin areas are wetted down as well. Avoid complete immersion in water because heat cannot leave the body as effectively. If available use a fan to help cool the animal while it is wet. If possible take the rectal temperature and stop cooling measures when the temperature is 103°F. Once you begin cooling measures take your pet to a veterinarian immediately and continue cooling (air conditioning) enroute if needed.