The Dolphins have signed 29-year old safety Keith Davis.  Davis played in 14 games last season for the Cowboys and he made 18 tackles, defensed 2 passes and forced a fumble.  Davis has now played in 68 games in his NFL career and he has made 134 tackles, defensed 5 passes and forced 3 fumbles.  This is Bill Parcells signing a player that he knows from his Dallas days and giving him a big chance to earn a job, possibly as a starter.