Matt Moore suffered a concussion against Cowboys

Miami Dolphins quarterback Matt Moore (8) is helped by staff after suffering an unknown injury in the first half of an NFL preseason football game against the Dallas Cowboys, Friday, Aug. 19, 2016, in Arlington, Texas. (AP Photo/Michael Ainsworth) (Michael Ainsworth / AP) ARLINGTON, TEXAS - Miami Dolphins quarterback Matt Moore suffered a concussion in Miami's 41-14 preseason loss to the Dallas Cowboys, and must now undergo the NFL's concussion protocol program to return to practice.

The hit occurred late in the second-quarter when a scrambling Moore, who has served as Ryan Tannehill's primary backup since 2012, clearly began his slide at the end of a 9-yard run. Cowboys linebacker James…