Why are other peoples pets so nasty compared to mine?
Though, regardless of if he was upset or not; he would be alone and might have to poop or pee anyway. Why would you not just leave him out in the back yard? Hell, just throw toy out the door and have him run out after it. If you are super lucky, by the time you are back he might not have even noticed you were gone yet (depending on the location of the vehicle relative to the backyard).
I am free of all prejudice. I hate everyone equally. - W. C. Fields