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That ancedote became fodder for a Newt Gingrich campaign ad earlier this month. Romney has since defended the decision, saying the dog was comfortable.
"This is a completely air-tight kennel and mounted on the top of our car,” Romney told Fox News. “He climbed up there regularly, enjoyed himself. He was in a kennel at home, a great deal of time as well. We loved the dog. It was where he was comfortable and we had five kids inside the car. My guess is he liked it a lot better in his kennel than he would have liked it inside."