A group of trainers training service dogs to be at the Vancouver International airport. | Liang Sen/Xinhua via Getty Images This past month I, like many Americans, flew back home for the holidays. On the first leg of that trip, from New York to Los Angeles, a dog in a “service dog” vest barked at me at the gate. The dog (not its given name), looked to be a stout French bulldog, paced back and forth, and yapped at a couple of other travelers.  On the way back from LAX, I noticed more dogs in service vests — a dachshund, another (different) Frenchie, a few mixed breeds — in line with th...

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