The Dragonship series Tome 1
The Last Dragon on Mars

For Lunar and his misfit crew of fellow orphans, every day on Mars is a fight for survival. They hunt for scraps in a wasteland ravaged by wars and storms, hoping they'll have enough to eat. Like most kids, Lunar knows the legends about dragons. How there's one for every planet, every moon and every star. But no dragon is coming to rescue them. One day, a scavenging mission goes dangerously wrong, forcing Lunar to hide underground.
There, he finds the only hope left for a dying planet : the last dragon. And when the dragon won't let him go, it becomes alarmingly clear : Lunar Jones is destined to save Mars.