Houston Texans quarterback Brian Hoyer (7) warms up before a preseason NFL football game against the Dallas Cowboys, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Dustin Vaughan (10) warms up before a preseason NFL football game against the Houston Texans, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys head coach Jason Garrett and wide receiver Dez Bryant (88) greet before a preseason NFL football game against the Houston Texans, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Dustin Vaughan (10) warms up before a preseason NFL football gamea, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

The Dallas Cowboys take the field before a preseason NFL football game against the Houston Texans, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys running back Gus Johnson (37) is tackled by Houston Texans inside linebacker Max Bullough (53) during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys running back Gus Johnson (37) is tackled by Houston Texans inside linebacker Justin Tuggle, rear, and host of players during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans quarterback Tom Savage (3) passes as Dallas Cowboys defensive end Ben Gardner (93) defends during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys running back Gus Johnson (37) is tackled by Houston Texans inside linebacker Justin Tuggle (57) during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Dustin Vaughan (10) hands the ball to running back Gus Johnson (37) against the Houston Texans during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans quarterback Tom Savage (3) passes the ball against the Dallas Cowboys during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys defensive tackle Terrell McClain (97) celebrates after sacking Houston Texans quarterback Tom Savage (3) during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Houston Texans running back Chris Polk (22) celebrates his touchdown against the Dallas Cowboys during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans quarterback Tom Savage (3) is sacked by Dallas Cowboys defensive tackle Terrell McClain (97) during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Dustin Vaughan (10) is sacked by Houston Texans safety Lonnie Ballentine (39) and inside linebacker Justin Tuggle (57) during the first half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys running back Gus Johnson (37) celebrates his touchdown against the Houston Texans with center Shane McDermott (62) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Houston Texans running back Kenny Hilliard (38) is tackled by Dallas Cowboys linebacker Keith Smith (56) and defensive tackle Ken Bishop (66) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans linebacker Kourtnei Brown (48) sacks Dallas Cowboys quarterback Dustin Vaughan (10) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans wide receiver Keshawn Martin (82) makes a touchdown reception over Dallas Cowboys cornerback Byron Jones (31) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys quarterback Tony Romo (9) celebrates a touchdown by defensive back Corey White (23) during the second half of a preseason NFL football game against the Houston Texans, Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys defensive back Corey White (23) celebrates his touchdown against the Houston Texans with wide receiver Dez Bryant (88) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys running back Gus Johnson (37) celebrates his touchdown against the Houston Texans with wide receiver Nick Harwell (17) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Dallas Cowboys running back Gus Johnson (37) scores over Houston Texans defensive back Charles James (31) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Houston Texans wide receiver Uzoma Nwachukwu (17) pulls away from Dallas Cowboys cornerback Byron Jones (31) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans running back Kenny Hilliard (38) recovers a fumble by Dallas Cowboys wide receiver Nick Harwell (17) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)

Houston Texans wide receiver Uzoma Nwachukwu (17) eludes Dallas Cowboys linebacker Donnie Baggs (46) during the second half of a preseason NFL football game Thursday, Sept. 3, 2015, in Arlington, Texas. (AP Photo/Brandon Wade)