To report an animal in weather-related jeopardy, please call the Humane Society of Missouri at (314) 647-4400
When temperatures and heat indices soar, pet owners are advised to take special precautions to keep pets safe. High temperatures can be deadly for pets left without a cool, shady place to rest and plenty of water. 

http://www.hsmo.org/vet-care/weathertips.html

Never leave a pet unattended in a parked car when the temperature is more than 70 degrees: When it’s 72 degrees outside, a car’s temperature can rocket to 116 degrees, even with the windows cracked. When it is 85 degrees outside, the temperature inside a car can soar to 120 degrees in minutes. Leaving a pet in a hot, unattended car is inhumane, illegal and can cause severe injury or even death within minutes.

Act immediately if you see a distressed animal in an unattended car:  Call the local police and the Humane Society of Missouri ANIMAL ABUSE HOTLINE  314-647-4400. A pet showing signs of distress such as heavy panting, unresponsive behavior, seizure or collapse needs IMMEDIATE attention.

(Cont. Reading)
http://www.hsmo.org/vet-care/weathertips.html