It is just TRADITION
Through the 2014 season, the Dallas Cowboys are 29-17-1 in games played on Thanksgiving Day.
Yes. They are playing on Thanksgiving Day against Oakland.
The Cowboys have played on Thanksgiving Day every year since 1966, with the exceptions of the 1975 and 1977 seasons.
Dallas, at least pro football fans and the Dallas Cowboys, celebrate Thanksgiving with football. The Cowboys host a home game every Thanksgiving. And those who are not Dallas Cowboys fans, if there are any in Dallas, celebrate Thanksgiving the same as the rest of the country, by getting together with family for a big turkey dinner.
Through the 2017 season, the Dallas Cowboys are 30-19-1 in Thanksgiving Day games.
Yes. It has become a tradition for the Dallas Cowboys to play a late afternoon home game on Thanksgiving Day, just as the Detroit Lions have long played an early afternoon home game on the last Thursday in November. Dallas occasionally also gets a home game on the Sunday before Thanksgiving.
Although the Detroit Lions have played on Thanksgiving since the 1930s, their record for holiday games is 33-36-2. The Dallas Cowboys did not begin playing on Thanksgiving until 1966, but they are closing in on the Lions' win total. The Cowboys are 27-15-1 on Thanksgiving.
Through the 2016 season, the Dallas Cowboys have a 30-18-1 record in games played on Thanksgiving Day.