Dallas picked up a thigh bruise in Sunday's 51-29 win over the Lions, John Boyle of the Seahawks' official site reports.
Dallas rushed once for one yard and returned a pair of kickoffs for 48 yards before getting injured. Rashaad Penny has dominated touches in Seattle's backfield lately and racked up 170 yards and two touchdowns on the ground in this one. If Dallas suits up for next week's season finale against Arizona, he'll likely split change-of-pace duties behind Penny with Travis Homer.