There are 4 books in the The Pit Dragon Chronicles series. The newest book is Dragon's Heart which came out in 2009.

1
Dragon's Blood

Book cover of Dragon's Blood
Dragons are trained to fight to the death, and two determined teens help free them in this spellbinding saga.

Training a dragon to be a fighting champion is the only way to freedom for fifteen-year-old Jakkin.
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2
Heart's Blood

Book cover of Heart's Blood
Jakkin risks everything--his freedom, his dragon, even his life--to rescue his beloved in this stirring sequel to Dragon's Blood.

4
Dragon's Heart

Book cover of Dragon's Heart

Austar IV isn't the planet it once was, and when Jakkin and Akki finally return to the dragon nursery, their homecoming arouses mixed emotions. Together they've survived the insurmountable, and now they can weather the brutal conditions of Dark After and communicate with the dragons they love. But with this…