In 54 career games (31 starts), Douglass had a record of 7–13, his best year being 2005 going 5–5 in 18 games (16 starts) for the Tigers. He has also spent time with the Toronto Blue Jays and Baltimore Orioles. In April 2008, Douglass signed with the Florida Marlins, but did not appear in a game for their organization before being released in May.