The Miami Dolphins in 1972. Although they were considered to have had a perfect season, they did lose three preseason games.
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.
Don Shula was the head coach of the Miami Dolphins in 1972.
the Miami dolphins did it, but it was when the regular season only had 12 games. in 1972
1972 Miami Dolphins