Dragon Sheep

Dragon Sheep are those which wear costumes to appear like dragons.

Official Description
"Only the most courageous ewes will survive the early trials unscathed. Only the most intrepid rams will climb above the woolen clouds of the common herd un-singed. Only the most valorous ovian elite will win the dragon armor that allows them to be counted among the legendary livestock of Berk. Each lamb, nuzzled among the cozy folds of their mother's fleece, dreams of attaining these glories as they grow into maturity, but only the very finest are chosen. The chilvalrous sheep who win the armor are the ambitious Dragon's best friend, helping them through difficult trials that hone their skills to the very pinnacle of combat proficiency."

- Dragons: Titan Uprising

Curse of the Hobgobbler
On New Berk, the Twins concoct ways to prank Gobber. Playing on his superstitions regarding Hobgobblers, they attract some to the island and then dress up the resident sheep in costumes to mimic even more Hobgobblers. As often happens with the Twins' pranks, the Hobgobbler population gets out of control.

Dragon Training
According to Dragons: Titan Uprising, only the best sheep for training receive a dragon costume, and serve almost a friends and coaches to dragons in training.

Physical Appearance
Dragon Sheep are the standard woolly white sheep of Berk with gray faces and legs. Additionally, they wear costumes to look like dragons so that they can move amongst them unharmed. Costumes appear to be leather-based, with a full mask with black 'horns', a patched leather cap covering most of their upper bodies, a row of 'spines', and two 'wings'. The costume can be various solid colors including but not limited to: red, purple, or yellow.