As a fantasy enthusiast who devours dragon-themed books like candy, I can't recommend enough 'The Inheritance Cycle' by Christopher Paolini. It's a perfect blend of epic adventure, dragon bonding, and coming-of-age heroism, much like 'Wings of Fire'. The world-building is rich, and the bond between Eragon and Saphira is heartwarming yet intense. Another gem is 'Dragon Rider' by Cornelia Funke, which has a lighter tone but still delivers that magical dragon-human camaraderie.
For those craving darker themes, 'Seraphina' by Rachel Hartman explores a world where dragons and humans coexist uneasily, with complex political intrigue. If you love the tribal dragon societies in 'Wings of Fire', 'A Natural History of Dragons' by Marie Brennan offers a scholarly twist, following a dragon naturalist in a Victorian-esque setting. Lastly, 'Dragon Keeper' by Carole Wilkinson is a hidden treasure with a strong focus on dragon conservation and ancient Chinese lore.