17 games
The Dolphins regular season record was 14-0 and they won out in the playoffs to wind up with a composite record for the 1972 season of 17-0.
Three.
The Miami Dolphins did not win all of their preseason games in 1972. They were 3 and 3 in the preseason. Interestingly, their last loss in preseason game 5 (August 31, 1972) was to the Washington Redskins, 27 - 24.
1972
75
11
1972 and 1973
They won one game.
No, the Dallas Cowboys did.
1972 and 1973
1972 and 1973.
All time they have won 400 games