Dogs of War / Adrian Tchaikovsky

Rex is a Good Dog. He loves humans. He hates enemies. He's
utterly obedient to Master. He's also seven foot tall at
the shoulder, bulletproof, bristling with heavy calibre
weaponry and his voice resonates with subsonics especially
designed to instil fear. With Dragon, Honey and Bees, he's
part of a Multi-form Assault Pack operating in the lawless
anarchy of Campeche, Southeastern Mexico. Rex is a
genetically engineered bioform, a deadly weapon in a dirty
war. He has the intelligence to carry out his orders and
feedback implants to reward him when he does. All he wants
to be is a Good Dog. And to do that he must do exactly
what Master says and Master says he's got to kill a lot of
enemies. But who, exactly, are the enemies? What happens
when Master is tried as a war criminal? What rights does
the Geneva Convention grant weapons? Do Rex and his fellow
bioforms even have a right to exist? And what happens when
Rex slips his leash?