The Miami Dolphins are not members of the AFC East :D
As of the 2010 season, the Dolphins have won 2 Super Bowls, 5 AFC championships and 12 AFC East championships.
No. The Redskins are in the NFC East while the Dolphins are in the AFC East.
AFC EAST
In 2008, the Miami Dolphins (11-5) won the AFC East Division.
11-5 with the AFC East championship.
2
Seven times - 1971-3, 1982, 1984-5, 1992.
The biggest rivalry seems to be between the New York Jets and the New England Patriots; both in the AFC East with the Dolphins.
No, the Redskins won't play the Dolphins until 2011. The Redskins play the AFC South in 2010. This year they play the AFC West, In 2008 they played the AFC North and in 2007 was when they played the AFC East, including being the victim of one of New England's perfect regular season.
The New England Patriots and the Miami Dolphins are tied for the most AFC East titles, with 14 each. The Patriots have won the AFC East title in 1978, 1986, 1996, 1997, 2001, 2003, 2004, 2005, 2006, 2007, 2009, 2010, 2011 & 2012. The Miami Dolphins have won the AFC East title in 1971, 1972, 1973, 1974, 1979, 1981, 1982, 1983, 1984, 1985, 1992, 1994, 2000 & 2008.
No. The Dolphins play the Cowboys based on the NFL's present (post-2002) scheduling rotation of inter-conference (AFC vs. NFC) games. The NFC East (Dallas Cowboys) play the AFC East (Dolphins) every four years - they played in 2003 and again in 2007. The Dolphins will play the Cowboys again (barring an appearance in Superbowl 45) in 2011.