Here I am not preaching about the heat in cars, though if you even fleetingly think of leaving your pet in the car for 5 minutes... I want you to try just one thing first... adjust the windows as you would for leaving your pet, park your car and just sit there, you wont believe how hot it will become in just a short period of time.
Now that you know for yourself how hot it becomes... please, please, please, start preaching about the problem to everyone you know - so that they too can start preaching the message.
Personally, already this year, I have had to report one instance of a dog being left in a car. Luckily the outcome was OK. Maybe someone else has learned this serious message.
Besides this, even out in the sun and doing everything according to the book heatstroke can strike down even dogs in their prime - so be especially careful.
Also remember that disease spreads more rapidly in the heat, there is the problem of flies too... and fleas and ticks.
And please dont forget the dangers that rivers, ponds, and lakes can pose to both pets and their owners who go in after them to save them.
Enjoy your summer!