Question: Which short film based off the title "How to Train Your Dragon", features a hunt for a lost sheep?

Context paragraphs:
How to Train Your Dragon (franchise): How to Train Your Dragon franchise (also referred to as simply HTTYD) from DreamWorks Animation consists of two feature films "How to Train Your Dragon" (2010) and "How to Train Your Dragon 2" (2014), with a third and final planned for a 2019 release.  The franchise is loosely based on the British book series by Cressida Cowell.  The franchise also consists of four short films: "Legend of the Boneknapper Dragon" (2010), "Book of Dragons" (2011), "Gift of the Night Fury" (2011) and "Dawn of the Dragon Racers" (2014).  A television series following the events of the first film, "", began airing on Cartoon Network in September 2012.  Its second season was renamed "Dragons: Defenders of Berk".  Set several years later, and as a more immediate prequel to the second film, a new television series, titled "Dragons: Race to the Edge", aired on Netflix in June 2015.  The second season of the show was added to Netflix in January 2016 and a third season in June 2016.  A fourth season aired on Netflix in February 2017 and a fifth season in August 2017.

Dawn of the Dragon Racers: Dawn of the Dragon Racers is a 2014 computer-animated short film by DreamWorks Animation and directed by Elaine Bogan and John Sanford.  Based on the film series of the same name.  It was directed by John Sanford and Elaine Bogan, and it features the voices of Jay Baruchel and America Ferrera along with the cast from the television series.  In the short, a hunt for a lost sheep turns into a competition between Hiccup and his friends for the first title of Dragon Racing Champion of Berk.

How to Train a Dog: How to Train a Dog is a 1936 short film released through MGM Studios starring Robert Benchley.  The short film demonstrates how not to train a dog, following Benchley's character getting the dog from a pet store.

Dragon Ball: The Path to Power: Dragon Ball: The Path to Power (Japanese: ドラゴンボール 最強への道 , Hepburn: Doragon Bōru Saikyō e no Michi ) , is the seventeenth Japanese animated feature film based on Akira Toriyama's "Dragon Ball" manga, following the first three "Dragon Ball" films and thirteen "Dragon Ball Z" films.  It is a re-telling of the original "Dragon Ball" anime series, mixing the elements from the first Dragon Ball search and the later Red Ribbon storyline.  It was originally released in Japan on March 2, 1996 at the Toei Anime Fair, along with the movie version of "Neighborhood Story".  The film was produced to commemorate the tenth anniversary of the original "Dragon Ball" anime.  It was also the last theatrically released Dragon Ball movie produced up until the release of "" in 2013.

Shaun the Sheep: Shaun the Sheep is a British stop-motion animated television series and spin-off of the "Wallace and Gromit" franchise.  The series stars Shaun — a sheep previously featured in the 1995 short film "A Close Shave" and in the "Shopper 13" short film from the 2002 "Wallace and Gromit's Cracking Contraptions" series — and his madcap adventures around a small farm as the leader of his flock.

Book of Dragons: Book of Dragons is a computer-animated/2D-animated short film based on the "How to Train Your Dragon" franchise.  It was produced by DreamWorks Animation and directed by Steve Hickner.  The short was released on November 15, 2011, on DVD and Blu-ray, along with "Gift of the Night Fury", another short film based on the "Dragons".

It's Me, Matthew!: It's Me, Matthew!  is a 2008 American short film based on actual events.  The semi-autobiographical short film was written, produced, and starring Michael McDerman, who used the stage name Michael Ferreira in this film.  It was directed by Neil Stephens.  The film running 15 minutes centered on the title character of Matthew, who is confronted with the inner struggle of looking at the past to understand why he's drawn into the personal relationships he's had.  His psychoanalyst helps him link the pieces of the puzzle from the present time to the past.  The film was screened at North Carolina Gay & Lesbian Film Festival, Rhode Island International Film Festival, Long Island Gay and Lesbian Film Festival, Anthology Film Archives, The Fortress of the Arts Festival of Shorts, Think Short Film Festival, West Hollywood International Film Festival, where it won a Juror Award, and it opened before the gay cinema's gay movie night at Clearview Cinemas, in New York City hosted by Hedda Lettuce.

Dragon Ball Z: Battle of Gods: Dragon Ball Z: Battle of Gods (Japanese: ドラゴンボールZ 神と神 , Hepburn: Doragon Bōru Zetto: Kami to Kami , lit.  "Dragon Ball Z: God and God") is the eighteenth Japanese animated feature film based on the "Dragon Ball" series and the fourteenth to carry the "Dragon Ball Z" branding, released in theaters on March 30, 2013.  It is the first "Dragon Ball" movie in 17 years to have a theatrical release, the last being in 1996, which followed the first three "Dragon Ball" films and the thirteen "Dragon Ball Z" films.  Unlike previous theatrical "Dragon Ball" releases, this was a full feature-length production with a stand-alone release and not shown as part of the now-discontinued Toei Anime Fair (formerly the Toei Manga Matsuri).

The Little Lost Sheep: The Little Lost Sheep is a short animated film produced by Columbia Pictures, and is the third to last theatrical appearance of Krazy Kat.

Legend of the Boneknapper Dragon: Legend of the Boneknapper Dragon is a 2010 animated short film by DreamWorks Animation that is a sequel to the feature film, "How to Train Your Dragon".

Supporting paragraphs: How to Train Your Dragon (franchise) Dawn of the Dragon Racers
Answer: Dawn of the Dragon Racers