Dog the Bounty Hunter 's son Garry Chapman -- who was fired, then reinstated , from a police force in Alabama last year -- is suing the department ... He says they only disciplined him to teach him a lesson for calling out a dirty cop. Remember ... Chapman's employment was terminated last year after his involvement in a fatal high-speed car chase. He was later reinstated, but he says he should've never been fired in the first place. In court documents, obtained by TMZ, Chapman alleges the