San Francisco 49ers quarterback Colin Kaepernick warms up before an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) warms up before an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) passes the ball against the San Francisco 49ers first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) is introduced before the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tim Sharp)

San Francisco 49ers tight end Vernon Davis (85) scores a touchdown against Dallas Cowboys outside linebacker Justin Durant (52) during first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) rolls out and throws a touchdown against the Dallas Cowboys first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys kicker Dan Bailey (5) kicks a field gun while Chris Jones (6) holds the ball during the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) rolls out as he is pursued by Dallas Cowboys defensive end Jeremy Mincey (92) as tackle Joe Staley tries to block during the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers free safety Eric Reid (35) recovers a fumble as linebacker Michael Wilhoite (57) looks on in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers free safety Eric Reid (35) carries the ball after recovering a fumble in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers tight end Vernon Davis (85) and quarterback Colin Kaepernick (7) celebrate a touchdown in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers inside linebacker Patrick Willis, second from left, intercepts a pass intended for Dallas Cowboys tight end Jason Witten (82) in the end zone during the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers head coach Jim Harbaugh, left, and San Francisco 49ers quarterback Colin Kaepernick (7) discuss plays in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) escapes the grasp of Dallas Cowboys defensive end Jeremy Mincey (92) in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers kicker Phil Dawson (9) boots a field goal as Andy Lee (4) holds during the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys head coach Jason Garrett directs his team in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers quarterback Colin Kaepernick (7) throws a pass in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) hands off to running back DeMarco Murray (29) against the San Francisco 49ers during the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) looks for an open receiver in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Tony Romo (9) runs back to the bench after throwing an interception in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers inside linebacker Patrick Willis (52) celebrates with teammate free safety Eric Reid (35) after intercepting a pass intended for Dallas Cowboys tight end Jason Witten in the end zone during first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers defensive back Perrish Cox, right, intercepts a pass by Dallas Cowboys quarterback Tony Romo in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys running back DeMarco Murray (29) is stopped down the sideline by San Francisco 49ers' Perrish Cox (20) in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers head coach Jim Harbaugh instructs his team from the sideline in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys head coach Jason Garrett attempts to get the attention of an official during the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Tony Romo (9) lifts himself up after being knocked to the ground in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers running back Carlos Hyde (28) falls into the end zone for a touchdown after a short run with help from tackle Joe Staley (74) as Dallas Cowboys outside linebacker Bruce Carter (54) defends in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) attempts a pass over Dallas Cowboys' Jeremy Mincey in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers running back Carlos Hyde (28) is congratulated on his touchdown run by quarterback Colin Kaepernick, right, in the first half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) prepares to pass against the Dallas Cowboys in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Tony Romo (9) throws an interception to San Francisco 49ers inside linebacker Patrick Willis under pressure from linebacker Aaron Lynch (59) during the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys free safety Barry Church (42) walks off the field after a San Francisco 49ers score in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

San Francisco 49ers defensive end Justin Smith sacks Dallas Cowboys quarterback Tony Romo (9) during the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers quarterback Colin Kaepernick (7) is knocked to the ground by Dallas Cowboys defensive end Jeremy Mincey (92) after throwing a pass in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys tackle Donald Hawkins (62) and Bruce Carter (54) combine to stop San Francisco 49ers wide receiver Anquan Boldin (81) after Boldin gained yardage following a reception in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Tony Romo (9) drops back to hand off the ball to running back DeMarco Murray (29) in the first half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys quarterback Tony Romo (9) is sacked by San Francisco 49ers defensive end Justin Smith (94) during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys' Tony Romo (9) makes a call at the line of scrimmage during the second half of an NFL football game against the San Francisco 49ers, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys' Tony Romo (9) shakes hands with head coach Jason Garrett after a touchdown against the San Francisco 49ers during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tony Gutierrez)

Dallas Cowboys quarterback Tony Romo (9) celebrates a touchdown against the San Francisco 49ers during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers' Colin Kaepernick (7) is tackled by Dallas Cowboys defensive back Sterling Moore (26) following a short run in the first half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers free safety Eric Reid (35) and Perrish Cox (20) defend as Dallas Cowboys' Dwayne Harris (17) goes up to grab a pass during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers strong safety Jimmie Ward (25) is unable to grab a pass during the second half of an NFL football game against the Dallas Cowboys, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

San Francisco 49ers running back Carlos Hyde (28) fights for extra yardage as Dallas Cowboys defensive tackle Henry Melton (69) and Tyrone Crawford (98) attempt the stop during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)

Dallas Cowboys' Terrance Williams (83) grabs a touchdown pass in front of San Francisco 49ers defensive back Dontae Johnson (36) during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tim Sharp)

Dallas Cowboys' Terrance Williams, left, and Zack Martin (70) celebrate a touchdown catch by Williams against the San Francisco 49ers during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/Tim Sharp)

San Francisco 49ers quarterback Colin Kaepernick and Dallas Cowboys quarterback Tony Romo greet each other after their NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. San Francisco won 28-17. (AP Photo/LM Otero)

Dallas Cowboys wide receiver Cole Beasley (11) is tackled by San Francisco 49ers strong safeties Jimmie Ward (25) and Antoine Bethea, right, during the second half of an NFL football game, Sunday, Sept. 7, 2014, in Arlington, Texas. (AP Photo/LM Otero)