The dolphins drafted thomas in the 5th round in the 1996 nfl draft. So the answer to your question is he didn't play for anyone before the dolphins, unless you mean college and in that case he played for Texas tech.
Texas tech
Dallas Thomas plays Guard for the Miami Dolphins.
Daniel Thomas plays for the Miami Dolphins.
Dallas Thomas plays for the Miami Dolphins.
Demaryius Thomas plays Wide Receiver for the Denver Broncos.
Zach Trotman plays for the Boston Bruins.
Zach Bogosian plays defense for the Winnipeg Jets.
Zach Boychuk plays center for the Carolina Hurricanes.
Zach Trotman plays defense for the Boston Bruins.
Zach Duke plays for the Milwaukee Brewers.
Zach Allen plays Guard for the Indianapolis Colts.
Zach Potter plays for the Houston Texans.