Dogs in Cars

I mentioned earlier that I planned to take poochie to work with me while it was still decent weather out. I have a Jeep Cherokee, so I am able to fit the crate in the back hatch. But I was thinking, how much air would be plenty. Do I roll all the windows down? Do I roll all the windows down and leave the hatch door open (assuming no one will take anything from my vehicle, but considering I am in charge of security here, I hope that doesn't happen)? Or do I bring my back receiver hitch rack and strap her to that while I am inside? I don't have much time as far as days to do this, I leave in Texas it will be 100 degrees in a week or so.

Any thoughts...