DeMarcus Ware intercepted the first pass of the season, one of six turnovers for a Dallas defense that also gave up 450 yards passing to Eli Manning and the New York Giants in the opener.
The Cowboys have been a study in defensive contradictions ever since.
They are the only team to keep Philadelphia out of the end zone this year, yet they've surrendered the first two 600-yard games for opponents in franchise history.
Dallas shut down one of the NFL's best rushing attacks to beat Oakland, then let Chicago score on the first eight possessions of a 45-28 loss.
Mostly the 7-6 Cowboys have just been embarrassing on defense this year. Dallas has given up at least five plays of 20 yards or longer in the past four games.
They try to reverse that trend Sunday against Green Bay.
