The bad news for the Miami Dolphins first because, well, it is also the more important news:
Right tackle Ja'Wuan James, three weeks from suffering a toe injury at New England, is not practicing today and not playing Sunday against the Dallas Cowboys. It will be the third game in a row James misses. It will be the third game in a row Jason Fox starts at right tackle.
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Linebacker Jelani Jenkins (ankle) is in a walking boot today and not practicing. Linebacker Koa Misi (unknown injury) is also not practicing today.
That means the Dolphins linebackers working with the starting unit are Zach Vigil, Kelvin Sheppard and Spencer Paysinger.