Frist get its attention, Then earn its trust (This, however, is not as easy as you may think). Once you can do that, they will be as loyal as a dog.
The incident was code named Night Fury and this is the story of those who survived and one who's fate runs close to the beast that is Umbrella.
The Night Fury is a species of dragon that appears in the movie adaptation of How to Train Your Dragon. Toothless is a Night Fury in the movie, in contrast with his original Common/Garden Dragon form in the book. Toothless is the only known Night Fury.