Books with dragons as main protagonist?

Bentwhistle the Dragon in A Threat from the Past by Paul Cude

Bentwhistle the Dragon in A Threat from the Part is an adventure story children and adults alike will love, about the present day world in which dragons disguised as humans have infiltrated the human race at almost every level, to guide and protect them. Three young dragons in their human guises become caught up in an evil plot to steal a precious commodity, vital to the dragon community. How will the reluctant hero and his friends fare against an enemy of his race from far in the past? Fascinating insights into the dragon world are interspersed throughout the book...

War of the Blades series by J.D. Hallowell-

A heroic fantasy adventure in the classic tradition of the genre. Delno Okonan is a young former soldier eager to put the swords and strife of war behind him, when a chance encounter leaves him inextricably entwined in a tangled web of dragons, magic, and intrigue, as he struggles to find his place among dragons and men, and stave off a plot by renegade dragon riders that threatens all he now holds dear.

The Heroes of Olympus series by Rick Riordan

Jason has a problem. He doesn't remember anything before waking up in a bus full of kids on a field trip. Apparently he has a girlfriend named Piper and a best friend named Leo. They’re all students at a boarding school for “bad kids.” What did Jason do to end up here? And where is here, exactly?

Piper has a secret. Her father has been missing for three days, ever since she had that terrifying nightmare. Piper doesn't understand her dream, or why her boyfriend suddenly doesn't recognize her...