Wear sunscreen (skin cancer) and note that a lot of sun isn't friendly for your dog.
Your dogs don't need to go everywhere with you.
&&& you better believe if I a dog in a car in the heat of summer and I know it's going to die I will break the car window! It is VERY legal! If you do it just make sure you call 911 and tell them what your doing so the police can arrive and sight the owner for animal neglect/abuse!
(Stepping off my soapbox now)