Sheep (Books)

Sheep are common livestock that appear in the How to Train Your Dragon book series.

Function
In both book series and real life, sheep are used as food. They are also kept for wool or as pets.

How to Train Your Dragon
When Hiccup goes to ask the Green Death if it comes with peace or war, he finds the dragon eating sheep. He was keeping a herd under his talons and from time to time he was releasing one only to catch it again, toss it in the air and swallow it whole.