Wolves are mentioned minimally in the How to Train Your Dragon Book series.
Wolves are a carnivore well-known world-wide and have had much impact on humans through our history. They are intelligent canines that have a pack-oriented society and are typically the apex predator in the ecosystems in which they occur. There are very few actual wolf species currently, with the Grey Wolf (Canis lupus) being the most well-known and most widespread. It territory formerly was quite extensive, but human exploitation have reduced the grey wolf's range to mainly to sub-arctic and mountainous regions. The Grey wolf is so widely distributed that there are some 38 subspecies recognized. This includes the domestic dog (Canis lupus familiaris) and the Australian canid the Dingo (Canis lupus dingo).
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.
There is a location that appears on the map at the beginning of the book called 'Wild Wolf Forests' located on the island of Hysteria. This forested area is not mentioned on subsequent maps.
Hiccup hears wolves and other creatures while trying to sleep at night, without Toothless to keep him warm.
|“||And when eventually he slipped in and out of feverish sleep, the nightdragons and the wind and the wolves seemed to be howling all together ...||”|
|— Book 3|
The Hysteric Tribe has a unique battle call known as the 'Hysterical Howl'.
|“||Five of the Hysterics were howling the Hysterical Howl like a pack of insane high-pitched wolves.||”|
|— Book 4|