1. Assess the situation: Before taking any action, ensure that the dog's life is indeed in imminent danger. Factors such as the outside temperature, the duration of the dog's exposure to heat, and the dog's overall condition should be taken into account.
2. Seek help first: If possible, seek assistance from law enforcement or animal control authorities who may have the necessary tools or expertise to safely handle the situation.
3. Use caution: If you decide to break the window yourself, exercise extreme caution to prevent injury to yourself or the dog. Wear protective clothing, such as gloves and eye protection, and be careful not to cut yourself on the shattered glass.
4. Choose the right window: If multiple windows are available, choose one that is away from the dog's immediate vicinity to reduce the risk of injury.
5. Use a heavy object: To break the window, use a heavy object such as a hammer or a car key. Strike the window with a sharp, forceful blow. Be prepared for the window to shatter and make sure to cover your face and body to avoid flying glass shards.
6. Open the window: Once the window is broken, carefully open it to allow fresh air to circulate inside the vehicle.
7. Stay with the dog: Stay with the dog until help arrives or you are able to get the dog to a veterinarian for evaluation and treatment.
Remember, breaking a window should be a last resort and should only be done if the dog is in immediate danger and there is no other option to free the animal quickly and safely.