The Dynamo have made their first addition of the summer transfer window.
Houston on Friday acquired midfielder Eric Alexander from the Montreal Impact in exchange for general and targeted allocation money.
Alexander, 28, has made 178 career MLS appearances since 2010. He helped the New York Red Bulls win the 2013 Supporters' Shield, appearing in all 34 regular season games. He has two caps with the United States National Team - one in 2011 and another in 2014.
From October 2012 to June 2015 he appeared in 80 consecutive regular season games and started all five MLS playoff games for the Red Bulls in 2014.