Heat stroke can be very serious for cat, potentially leading to brain damage and even death. It's important that you immediately contact your veterinarian if your cat is suffering from heat stroke.

The most common cause of heat stroke in cats is when they're left in closed or poorly ventilated cars that are exposed to the sun. It can also occur due to excessive exercise or excitement or lack of drinking water. The signs of heat stroke include uncontrolled panting, open-mouthed breathing, foaming at the mouth, drooling, and a bluish or gray appearance to the gums and tongue.