I am sure it's been discussed elsewhere but here is my take on the playoff scenarios for Dallas. I did this quickly, so it is possible I missed something.
*** NOTE: This is assuming Dallas wins out .. I'm not saying they will, but they have to in order to have a chance to make the playoffs (unless multiple teams lose multiple games of course) so for their playoff scenarios, that assumption has to be made.
Saints (9-4) .. play Jets (W), Falcons (W), Buccaneers (W) .. Projected (12-4) ..
- Saints must win 1 game against an NFC opponent to rank ahead of the Cowboys
Panthers (9-4) .. play Packers (W), Buccaneers (W), Falcons (??) .. Projected (11-5 to 12-4)
- Panthers must win 2 games or 1 game and have better common opponent record to rank ahead of the Cowboys
Seahawks (8-5) .. play Rams (??), Cowboys (L) and Cardinals (W) .. Projected (9-7 or 10-6) ..
- Seattle must win against the Cowboys to rank ahead of Cowboys
Falcons (8-5) .. play Buccaneers (W), Saints (L), Panthers (??) .. Projected (9-7 to 10-6) ..
- Falcons must win 2 games to rank ahead of the Cowboys
Lions (7-6) .. play Bears (W), Bengals (??), Packers (L) .. Projected (8-8 to 9-7) ..
- Lions must win out to and have better common opponent record to rank ahead of the Cowboys
Packers (7-6) .. play Panthers (L), Vikings (L), Lions (W) .. Projected (9-7)
- Packers must win out to rank ahead of the Cowboys
Again, all of that is assuming the Cowboys win out, which is no guarantee by any means.
To make things simple by avoiding deep tie-breaker scenarios ..
- The Cowboys need to win out, but can technically still make the playoffs at 9-7
- The Cowboys need to beat the Seahawks no matter what else happens
- The Falcons need to lose at least 2 games more than the Cowboys (Cowboys lose tie-breaker)
- The Lions need to lose 1 game more than the Cowboys (tie-breaker possible with same record as Cowboys)
- The Saints need to lose 3 games and the Cowboys win out
- The Panthers need to lose 3 games and the Cowboys win out (tie-breaker possible if Panthers only lose 2)
- The Packers need to lose 1 more game than the Cowboys (Cowboys lose tie-breaker)
*** Of course all of this is based on head-to-head records and/or tie-breakers. 3-way tie-breakers are more involved.