Oh good grief. Just admit it was a boo-boo.
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See, this is bullshit (link to ABC News). No dog wants to ride 7 hours at highway speeds. And, even if the dog did want to ride this way- no dog wants to have diarrhea, get hosed off at a gas station and go back up into the carrier on the roof.
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Ann Romney's comment - "..the dog loved to go on vacation", is undoubtedly true. But, I think the pup would have liked it even more if he didn't ride on the roof - in a kennel full of dog poop. Like if he rode in the car!
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And, of course, despite how much the dog loved it, this is illegal in Mass., New York, and Canada (states and countries they drove through).