Dallas Cowboys DT Ryan Davis (hamstring) has been ruled out for Week 8. CB Morris Claiborne (concussion), RB Lance Dunbar (knee), OT Chaz Green (foot), DE David Irving (ankle), DE Demarcus Lawrence (back, shoulder), CB Orlando Scandrick (hamstring), OT Tyron Smith (back) and LB Kyle Wilber (neck) are listed as questionable. Davis and Green did not participate in practice Friday, Oct. 28. Claiborne and Wilber fully participated in practice, while the other players were limited during practice.