How to Train Your Dragon is the first of a series of books that take place in a fictional Viking land where dragons are real. A boy named Hiccup is sent out to capture and train a dragon as a right of passage. He captures a dragon, Toothless, and proceeds to try to train him with his own methods after the one-page guide on training dragons proves useless.
The book was adapted into a 3-D animation film in 2010 and the sequel is expected out next year. The film was very heartfelt and enjoyable. However, there are some major changes from the book so this might be a 'watch the movie before reading the books' book/film combo.