The Portland Sea Dogs are a Minor League Baseball team based in Portland, Maine, that plays in the Double-A Northeast league. Established in 1994, the Sea Dogs are the Double-A affiliate of the Boston Red Sox. Prior to 2021, the team competed in the Eastern League. The Sea Dogs became part of the Red Sox system for the 2003 season; previously they were affiliated with the Florida Marlins. The change in affiliation brought success in the 2005 and 2006 seasons as the Sea Dogs went to the Eastern League championship series both years. They won their first-ever title on September 17, 2006, defeating the Akron Aeros, 8–5, in a rematch of the series from the previous year. It was the first Double-A championship for a Red Sox farm team since 1983 when they were based in New Britain, Connecticut. Currently, all games are carried on a network of radio stations with Mike Antonellis providing the play-by-play, with the flagship WPEI and select TV games on NESN with Eric Frede play-by-play and former Red Sox relief pitcher Ken Ryan.