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Odd question maybe, but what did you do about his need to go to the bathroom? A long day of travel and being stuck inside the entire time, I mean sometimes a doggy has got to at least pee.

No, that was definitely part of the consideration. The Dallas airport has a central outdoor area, so we took him there for the layover. He was cooped up for about 5 hours max at a stretch, which is well within his toileting window.