If you look a bit deeper: The Kansas City Chiefs can't run the ball either (450/1790). Both they and Dallas averaged four yards per carry, and were only separated in team rushing rankings by 85 yds. (Cowboys: 429/1705). We were also statistically better than the Rams, who were next to last in the League in YPC (3.9).
Where we really stunk it up was in the rushing TDs category, where the Cowboys were dead last with only six (6) the entire season, two less than the 31st-ranked team. By way of comparison, the Buffalo Bills had thirty-two (32) rushing TDs this past season.
The Cowboys were also tied with the Rams for dead last in carries of 20+ yds. (3).