Five minutes or less is all it takes to reach dangerous temperatures for your dog or cat if left inside a vehicle, even if the windows are left partially open and you're parked in the shade. Veterinarian Dr. Karen Sears says that people should just simply refrain from keeping their pets inside a vehicle when it's warm out.
Sears explains that some animals are more prone to overheating than others.
Some signs that your pet may be suffering from heat exhaustion are: fever, vomiting, glazed eyes, dizziness, restlessness, heavy panting, lack of appetite and lack of coordination. Dr. Sears said that people should lower their pets body temperature by gradually by providing water to drink, applying a cold towel or ice pack to the head, neck and chest area, or by immersing the dog in cool not cold water.