"Happy Hot Diggity Dog Holiday!" is the first segment of the twenty-third episode of Mickey and the Roadster Racers.
During Christmas, Hot Dog Hills is hosting its annual Ornament Palooza in which the winning team has the honor to put the Hot Diggity Dog Tree Topper on top of the tree. Billy Beagle (dressed as Santa Billy) has left clues to where he has hidden the ornaments all over Hot Dog Hills. Chip 'n' Dale take part in the race in separate cars in order to win the Hot Diggity Dog Tree Topper for each other by pairing up with Goofy and Donald while Mickey is paired with Minnie and Daisy is paired with Pete. But as Pete and Daisy win the Hot Diggity Dog Tree Topper, Chip 'n' Dale tell them how each of them wanted to win the Hot Diggity Dog Tree Topper to give to each other for Christmas. Pete is so moved by their story that he and Daisy give Chip 'n' Dale the Hot Diggity Dog Tree Topper for Christmas, and Chip 'n' Dale have the honor of putting the star on top of the tree in the plaza.