GRASS VALLEY, Calif.—A canine resident of the Sierra Nevada town of Grass Valley is set to star in an hour-long British documentary about the "world's tallest dog."

Gibson is a harlequin great Dane who is nearly 3 1/2-feet tall at the shoulder and more than 7 feet tall when he stands on his hind legs.

He's been certified the world's tallest dog by the Guinness Book of World Records.

Gibson is set to be filmed by a crew from London's Firefly Film and Television Production on St. Patrick's Day in downtown Grass Valley.

His owner, Sandy Hall, says the crew is particularly interested in recording children's reactions.