Originally Posted by cheehab
I got a tall cap with sliding windows for my 70 lb doberman. He's fine with all 3 windows open (front and 2 sides) on most warm days when the truck is not moving. Regardless of how many windows I open, I would not leave him in there on a really hot day but I feel like you already know this. When we're moving, I will crack the sides and open the small front window and he is fine. When you're shopping for a cap, I would definitely get sliding windows over venting windows so a breeze can flow better when the truck is stationary. I also sprang for the headliner in mine, my vet reccommended it, I didn't need anyone gettting cut on or licking the fibrglass.
So to answer you question, Yes I do think opening the little window will allow enough air as long as you are moving and it's not crazy hot, but definitely not when the truck is parked.
He's moving to Arizona, so that depends which part of the state he's moving to. If it's by flagstaff, then he could probably get by. But if he moves to southern AZ, where it does get "crazy hot", even just stopping at a traffic light with no air moving could definately hurt a dog. I like JJ Cusoms' idea... that way you'd never have to worry about your 4 legged babies.
I've lived in Phoenix and Yuma and there is no way I'd take them out without A/C.
Also depends on their ages and health as to how well they will be able to handle the heat.