This is both harder and more of an adrenaline rush than it seems, because the sled likes to tip over and keeping it from doing so involves a lot of squatting and leaning, while going uphill means getting your weight off the sled and running behind, like pushing a grocery cart, to help the dogs.

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To return to the matter of stopping: The Stealth-X designers envision riders controlling their speed by carving like a downhill skier and stopping by kicking the sled sideways in a skilike spray of snow.

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The owner's English-speaking son even throws in a little advice: pull on the reins, like a horse, to bend the runners and steer the sled.

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Hot weather bothers dogs more than people, especially really furry, really active dogs like my Golden and most of the other dogs around me in Vermont, labs, sled dogs, cattle dogs, etc.

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"It's like saying, 'There's no Santa Claus, ' and suddenly seeing the sled go across the sky, " recalls Mr. Jerome, who says he's seen the Toaster 32 times.

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Skeleton looks like something straight out of Willy Wonka: Hurtling face-first down a frozen track on a sled that resembles a cafeteria tray, Ms. Uhlaender often tops out at 80 miles per hour with her chin inches from the ice.

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