Cowboys LT Tyron Smith (back) ruled out vs. Dolphins

(Photo credit: Bill Streicher-USA TODAY Sports)
Dallas Cowboys left tackle Tyron Smith has been ruled out for Sunday's game at the Miami Dolphins because of a back injury.

A two-time All-Pro and eight-time Pro Bowl selection, Smith was listed as doubtful before he was downgraded on Saturday after not practicing this week.
Smith, who turned 33 on Dec. 12, will miss his fourth game this season. The Cowboys said that Chuma