Dolphins add Arkin off practice squad

IRVING, Texas -- With the Miami Dolphins losing a left tackle and left guard, the team signed guard David Arkin off the Cowboys' practice squad Tuesday.

Arkin, a 2011 fourth-round pick from Missouri State, was cut last week then placed back on the Cowboys' practice squad. The Cowboys valued Arkin's abilities to play both guard positions. As recently as last week, coach Jason Garrett said Arkin was improving.

Arkin never played in a regular-season game for the Cowboys, surpassed by veteran players such as Nate Livings and Mackenzy Bernadeau and even second-year guard Ronald Leary.

The Cowboys have just one offensive lineman, guard Ray Dominguez, on the practice squad.

Miami is in need of offensive linemen after Jonathan Martin left the team because of emotional issues and the team then suspended Richie Incognito for his alleged mistreatment of Martin.

The NFL is investigating the troubled relationship between the two offensive linemen.