McQuaide agreed to a one-year contract with the Cowboys on Monday, Calvin Watkins of the Dallas Morning News reports.
McQuaide will take over the long-snapping role that L.P. LaDouceur occupied last season.
Several Rams who were on the injury report are active for Sunday's game at San Diego. The list includes tight end Cory Harkey (quadriceps), linebacker Daren Bates (groin), linebacker Will Herring (foot), linebacker James Laurinaitis (foot) and linebacker Jake McQuaide (back).
Six Rams have been deemed questionable or probable for the Sunday game against the host Chargers.
The questionables are tight ends Jared Cook (back) and Cory Harkey (quad) and long snapper Jake McQuaide (back).
The probables are linebackers James Laurinaitis (foot), Daren Bates (groin) and Will Herring (foot).