Gift of the Night Fury

Dragons Gift of the Night Fury is a 2011 computeranimated short film by DreamWorks Animation and directed by Tom Owens. It was released on November 15, 2011, on DVD and Bluray, along with another original animated short film Book of Dragons.

During a set of winter holidays, all the dragons of Berk unexpectedly depart, leaving everyone distraught. The only exception seems to be of Toothless, who cannot fly independently. Out of compassion, Hiccup creates him a new prosthesis allowing him independent flight, and thus allows his escape. Three days later, Meatlug, a Gronkle dragon whom Fishlegs had kept chained, escapes, inadvertently taking Hiccup. Meatlug travels to a sulfurhot springs island where the other dragons have been hatching their eggs. Astrid and the gang also discover Dragon eggs in Meatlugs nest, which they scatter around Berk in hopes of lifting the villagers spirits. This plan backfires because dragon eggs hatch with an explosion, devastating Berk.While looking for Toothless, Hiccup meets Stormfly Astrids Deadly Nadder, Hookfang Snotlouts Monstrous Nightmare and their babies. Wanting to get a ride home, Hiccup inadvertently triggers their return migration. Despite the devastation, Berk citizens are filled with joy to see their dragons back. ........

Source: Wikipedia