... nothing really. She was only three weeks old -- clearly too weak to hold a pillowcase full of candy. Plus, that particular year, it was frigid outside, so a coat would have spoiled any cute costume I may have found to fit my 8 pounder.
So we dressed her in this onesie, took photos with the cousins who were old enough to trick-or-treat and called it a night.
Oh, yeah, we also dressed up the dog as a BYU fanatic (one of my old shirts). As a kid, we used to put t-shirts on our black lab all of the time -- not just for Halloween. That dog wore my dad's shirts, though, since she was overweight. (Each of us kids fed her a bowl of food daily -- but that's a whole 'nother story!)