I really dont since my boys are just in the house with me during the day but this is a good topic to have as a reminder and I know many will have great ideas to add.
Last visit I took to Butchko, the bulldog vet, was a couple months ago and it was around 10 in the morning so not even hot yet and when I registered at the check-in they told me they had lost one already out in the car. It was not even out of the 70's yet, how sad is that?!?! Figure it couldnt even have been there that long and started to respirate and they couldnt save. Heart breaking!!! They had only brought their pup in for something minor and lost him that fast. Even if you think it isnt hot outside and you are out and about make sure to have your air conditioner on while in the car please.