The division-leading Dallas Cowboys and Terrell Owens handed the Eagles a decisive 38-17 loss on Sunday night football in Philadelphia. Julius Jones powered into the end zone from two yards out on Dallas' opening drive, but Brian Westbrook answered with a short touchdown of his own after a 45-yard reception by Reggie Brown gave the Eagles' first-and-goal. Then Tony Romo took over, hitting Tony Curtis for a short passing touchdown. Marion Barber III carried it in from five yards out for Dallas after Donovan McNabb was intercepted by the Cowboys' defense. Romo connected with Owens for a 45-yard bomb in the third quarter, making the score 28-7 Dallas. After a David Akers' field goal, Romo got his third touchdown on a 20-yard pass to tight end Jason Witten. McNabb finished the scoring with a 10-yard touchdown pass to Hank Baskett. McNabb passed for a touchdown and 264 yards, but also two interceptions. Westbrook racked up 156 all-purpose yards in another strong showing. Owens burned the Eagles' defense for 174 receiving yards. Philadelphia fell to 3-5 and the team was largely uncompetitive against the Dallas squad.

Based on the above article, answer a question. How many points did the Eagles lose by?
21