Redskin quarterback Joe Theismnn underwent two hours of treatment yesterday for his pulled right hamstring muscle and said the leg was "feeling pretty good," according to a club spokesman at Redskin Park.

The team did not practice yesterday, but will resume afternoon workouts today in preparation for Sunday's game with the Cowboys in Irving, Tex. The spokesman said it wasn't known how much Theismann will be able to practice today. He was injured early in Sunday's 24-0 loss to Philadelphia and by the third quarter proved nearly immobile trying to chase Jerry Robinson during the linebacker's 59-yard touchdown run with a recovered fumble.

"It's still hard to tell how much better the leg actually is, but, for sure, it hasn't gotten any worse or regressed," said the official, who added that Theismann's daily treatments consist of the application of ice to midthigh and massages by team trainer Bubba Tyer and special therapeutic aids.

Theismann has started 33 consecutive games. If he can't start against Dallas Sunday, backup Mike Kruczek, for several years Terry Bradshaw's understudy at Pittsburgh, will go.

If Theismann is not sufficiently recovered by Friday, the Redskins may activate former second-stringer Kim McQuilken, who was released in training camp.