Wolves are a significant wild animal to historical Vikings, but are only mentioned and not seen in the How to Train Your Dragon Franchise.
Wolves (Canis lupis) are wild canines - quadrupedal mammals. They are carnivores and hunt in socially complex packs, working together to take down prey much larger than themselves. A mated pair stay together for life, and produce 5-6 pups once a year. Wolves were much more widespread across the world, but competition and hunting by humans has reduced their range and numbers.
Wolves appear in Norse Mythology, especially in the form of monstrous Wolf-Gods. The most famous of these is Fenrir. Fenrir is the offspring of the God Loki. He is also foretold to kill the God Odin during Ragnarok (the end times). Because of this prophesy, the Gods tied him up. Fenrir bit off the hand of the God Tyr while tying him down.
The God Odin is said to have had two wolf companions for hunting named Geri and Freki.
Skoll and Hati are the wolf-sons of Fenrir, and are in part responsible to the progression of night and day. Skoll chases the Sun Goddess, Sol, across the heavens trying to eat her, while Hati chases Mani, the Moon God. During Ragnarok, both wolves are predicted to finally catch their prey and eat the Sun and Moon.
In the episode, "Bad Moon Rising", Tuffnut gets bitten by an unknown animal. Bite comparisons from dragons show it is not from any known dragon. However, Gobber knows of a tale about the mythical Lycanwing dragon, whose bite will turn the bitten into a dragon, and was once human itself. Spurred by the story, Tuffnut imagines himself metamorphosing into a dragon. Later, Snotlout discovers the actual culprit of the bite - a wolf. The wolf itself is never seen, as Snotlout captures it in a bag.
There is a minor character appearing primarily in this game named Wolflegs
The development of Toothless (and by extension, Night Furies) has involved inspiration from many animal species. According to Dreamworks' Youtube Video Series, "The DreamWorks Download", Toothless' "eyes were based on a cross between a wolf and a cat's eye."
- In the How to Train Your Dragon Book Series there is an untrainable species of dragon called a Wolf-fang.
- Gray Wolf on Wikipedia
- 100 HTTYD Facts Only True Fans Know DreamworksTV, (Published on Aug 27, 2015). YouTube.