The Cowboys claimed CB Michael Coe off waivers from the Dolphins and released CB Vince Agnew.
Coe played in one game for Miami this season, making one tackle. He began the season with the Giants and appeared in seven games with one start, recording 13 tackles and two passes defensed.
Coe had been with the Giants since 2010. He also has spent time in his career with the Jaguars and Colts.
Agnew appeared in four games for Dallas this season.