Never leave a pet in a car unattended, even if it is only in the 70s. A car can quickly become 20â€“30 degrees hotter than outside temps. Also make sure your pets have shade and fresh water at all times. If you feel it is too hot for you to take a walk, it is too hot for your pet as well. Heat stroke happens very quickly. It”s not a good idea to drive with the windows down and pets heads hanging out the windows. Even though it seems like fun for the dog, it is a good way to get eye damage and ear infections from flying debris.