Dallas is a 21-point favorite at MGM Mirage and Westgate Superbook over the Miami Dolphins with early Week 3 action on the Cowboys.
After opening as 18.5-point favorites, the 2-0 Cowboys have been pushed to minus-21 at multiple books with a consensus line over 20 points.
Dallas was last a favorite by 21 or more points in 1987. Only 11 teams in NFL history have been favored by as many as 20 points. They have a 2-9 record against the spread, according to Pro Football Reference.
The Dolphins did not score in Week 2, a 43-0 loss to the New England Patriots, who were favored by 19.5 points.
Miami lost 59-10 in Week 1 to the Baltimore Ravens.
Dallas beat the New York Giants 35-10 in Week 1 and won at Washington in Week 2, 31-21 over the Redskins.