Miami Dolphins cornerback Brent Grimes (21) tackles Dallas Cowboys wide receiver Terrance Williams (83) during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys quarterback Tony Romo (9) calls a play from the line of scrimmage during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Miami Dolphins tight end Charles Clay (42) runs with the ball during the first half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Miami Dolphins cornerback Cortland Finnegan (24) pulls the shirt of Dallas Cowboys wide receiver Dwayne Harris (17) during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Miami Dolphins quarterback Ryan Tannehill (17) looks to pass during the first half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Miami Dolphins running back Knowshon Moreno (28) runs with the ball ahead of Dallas Cowboys outside linebacker Anthony Hitchens (59) during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Miami Dolphins running back Knowshon Moreno (28) carries the ball as Dallas Cowboys defensive end George Selvie (99) attempts to tackle during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys quarterback Tony Romo (9) looks to pass during the first half of an NFL preseason football game against the Miami Dolphins, Saturday, Aug. 23, 2014 in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys defensive tackle Davon Coleman (60) grabs the jersey of Miami Dolphins quarterback Ryan Tannehill (17) during the first half of an NFL preseason football game, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Miami Dolphins running back Knowshon Moreno (28) breaks up a a tackle by Dallas Cowboys defensive back Johnny Thomas (47) during the first half of an NFL preseason football game Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys wide receiver LaRon Byrd (80) grabs a 27-yard pass for a touchdown during the second half of an NFL preseason football game against the Miami Dolphins, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys free safety Barry Church (42) celebrates with defensive back Sterling Moore after recovering a fumble during the first half of an NFL preseason football game against the Miami Dolphins, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Miami Dolphins head coach Joe Philbin looks up during the second half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys defensive back Tyler Patmon (35) is congratulated by safety Ahmad Dixon (36) after intercepting a pass during the second half of an NFL preseason football game against the Miami Dolphins, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Dallas Cowboys defensive back Tyler Patmon (35) intercepts a pass intended for Miami Dolphins wide receiver Brian Hartline (82) during the second half of an NFL preseason football game, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/J Pat Carter)

Dallas Cowboys head coach Jason Garrett gestures during the first half of an NFL preseason football game against the Miami Dolphins, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. (AP Photo/Lynne Sladky)

Miami Dolphins running back Orleans Darkwa (3) runs toward the end zone for an NFL fottball game-winning touchdown as Dallas Cowboys linebacker Dontavis Sapp (45) attempts to defend during the second half, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. The Dolphins defeated the Cowboys 25-20. (AP Photo/J Pat Carter)

Miami Dolphins tight end Gator Hoskins (89) celebrate a touchdown during the second half of an NFL preseason football game against the Dallas Cowboys, Saturday, Aug. 23, 2014, in Miami Gardens, Fla. The Dolphins defeated the Cowboys 25-20. (AP Photo/J Pat Carter)