"Happy Hot Diggity Dog Holiday!" is the first Christmas-themed episode of the animated Disney Junior animated show Mickey Mouse: Roadster Racers. It and its sister episode "Happy Holiday Helpers" was premiered on the Disney Channel's Disney Junior morning block on December 1, 2017.
During Christmas, Hot Dog Hills is hosting it's annual Ornament Palooza in which the winning team has the honor to put the Golden Star 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 and Dale take part in the racing in separate cars in order to win the Golden Star 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 won the Golden Star Tree Topper both Chip and Dale told them how each of them wanted to win the Golden Star Tree Topper to give to each other for Christmas. Pete was so moved by their story that he and Daisy gave Chip and Dale the Golden Star Tree Topper for Christmas and have the honor to put the star on top of Tree in the plaza.