It was Arsenal who went one season without a loss.
2008 Detroit Lions
Yes. In the 1934 regular season the Chicago Bears went 13-0 and the Cincinnati Reds went 0-8. In the 1942 season the Chicago Bears went 11-0 and the Detroit Lions went 0-11.
It has never been done.
The most regular season victories for a Boston Celtics team was in 1985-86 when they went 67-15. They won the NBA championship that season, the MVP award went to Larry Bird, and the 6th Man award went to Bill Walton.
The first team that went undefeated in regular season and won the Super Bowl was the 1972 Miami Dolphins who went 17-0-0 (14-0-0 in the regular season and 3-0 in the playoffs).
The Denver Broncos in 1999. After winning back-to-back Super Bowls, they went 6-10 the next year.
He went to the Cleaveland Cavs for the 2010-11 season
green bay packers and patriots
Three times the uconn womens basketball team went through a season undefeated.
The New England Patriots went 16-0 in the 2007-2008 regular season.