This is Part Four of Episode One of 2008′s NFL Hard Knocks featuring the Dallas Cowboys from NFL Network. Be sure to subscribe to my Classic NFL channel here at Shrevedude1, as well as my NFLNow Channel featuring today’s NFL stars at NFL2011Channel. I am dedicated to bringing you the most NFL programming you can find on YouTube! Also, be sure to add me on Facebook at johnvairinsports@mail.com…