Washington Redskins running back Adrian Peterson (26) carries the ball during the second half of an NFL football game against the Dallas Cowboys, Sunday, Oct. 21, 2018, in Landover, Md. (AP Photo/Alex Brandon)

Washington Redskins quarterback Colt McCoy, left, and quarterback Alex Smith, right, walk across the field before an NFL football game against the Dallas Cowboys, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)

Dallas Cowboys quarterback Dak Prescott (4) prepares to pass the ball during the first half of an NFL football game against the Washington Redskins, Sunday, Oct. 21, 2018, in Landover, Md. (AP Photo/Mark Tenally)

Dallas Cowboys wide receiver Michael Gallup (13) pulls in a touchdown pass during the first half of an NFL football game against the Washington Redskins, Sunday, Oct. 21, 2018, in Landover, Md. (AP Photo/Alex Brandon)

Dallas Cowboys wide receiver Michael Gallup (13) pulls in a touchdown pass as Washington Redskins defensive back Greg Stroman (37) pursues during the first half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Andrew Harnik)

Dallas Cowboys wide receiver Michael Gallup (13) runs for a touchdown as Washington Redskins defensive back Greg Stroman (37) and cornerback Fabian Moreau (31) pursue during the first half of an NFL football game, Sunday, Oct. 21, 2018, in Landover, Md. (AP Photo/Andrew Harnik)

Washington Redskins running back Adrian Peterson (26) runs between Dallas Cowboys defensive end Tyrone Crawford (98) and defensive end Demarcus Lawrence (90) during the first half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Mark Tenally)

Washington Redskins quarterback Alex Smith (11) looks for an open man during the first half of an NFL football game against the Dallas Cowboys, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)

Dallas Cowboys quarterback Dak Prescott (4) scrambles with the ball during the first half of an NFL football game against the Washington Redskins, Sunday, Oct. 21, 2018, in Landover, Md. (AP Photo/Andrew Harnik)

Dallas Cowboys quarterback Dak Prescott (4) hands off the ball to running back Ezekiel Elliott (21) during the first half of an NFL football game against the Washington Redskins, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)

Washington Redskins running back Adrian Peterson (26) is chased by Dallas Cowboys free safety Xavier Woods (25) during the second half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Andrew Harnik)

Washington Redskins running back Kapri Bibbs (46) carrels the ball into the end zone for a touchdown as Dallas Cowboys cornerback Byron Jones (31) chases him during the first half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)

Washington Redskins linebacker Ryan Kerrigan (91) closes in on Dallas Cowboys quarterback Dak Prescott (4) forcing a fumble and a touchdown during the second half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Mark Tenally)

Dallas Cowboys quarterback Dak Prescott (4) dives over Washington Redskins defensive end Jonathan Allen (93) for a touchdown during the second half of an NFL football game, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Andrew Harnik)

Washington Redskins quarterback Alex Smith (11) celebrates with fans after an NFL football game against the Dallas Cowboys, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)

Dallas Cowboys quarterback Dak Prescott (4) wipes his head with a towel as he walks off the field during the second half of an NFL football game against the Washington Redskins, Sunday, Oct. 21, 2018 in Landover, Md. (AP Photo/Alex Brandon)