Eathed, A Dragon's Tale — Troy Lee Henderson

The last of his kind, Eathed, an ancient dragon, has finally found a place to live out his last days peacefully. He is discovered by three young brothers hiding in a cave near their village. Few villagers believe there really is a dragon, so only an old knight, Sir Allistair Bayne, is sent to seek out the dragon. A battle ensues during which both knight and dragon fall in spectacular fashion. Simon takes pity on Eathed, and an unlikely friendship ensues. This is book 1 of the Hill Brothers Trilogy.