This one is easy. All you need to tame it is to shoot it down with a boa launcher in the tail so it can't fly, let it fall into a valley that it cannot escape from, bring it fish every day, and finally touch it on the nose. It will be your lifelong friend after that. Just don't trust it to save your leg in a battle with another dragon, you will literally have no leg after that and will need to learn the peg leg engram(does not exist, but should!).