By trading Ferguson, the Cowboys gain approximately $2.4 million in salary cap room.
Ferguson missed 15 games last year with after tearing his biceps tendon the season opener against the Giants.
Jay Ratliff and Tank Johnson are expected to compete for the starting position next season with Ferguson out of hte mix.
In 2007, the Cowboys were solid if not spectacular up front.
The good news is Jay Ratliff proved to be a keeper at nose tackle after replacing the injured Ferguson and getting a multi-year contract extension.
The bad news is the Cowboys didn't get the impact they hoped out of Johnson, who took awhile to get in football shape after being suspended for the first eight games of the season.
Last year Ratliff recorded 30 total tackles including three sacks while Johnson had 11 total tackles and two sacks in eight games.
Ferguson has plenty of ties to new Dolphins' team president and former Cowboys coach Bill Parcells. He played for Parcells with the Jets and in Dallas.
Ferguson is expected to help the Dolphins transition to the 3-4 defense as the team's starting nose tackle in 2008.
'Boys Send Ferguson to Miami
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