A 77th-minute goal from Maynor Figueroa saw Dallas end Sporting Kansas City's undefeated start to the season with a 1-0 win.
Oscar Pareja's men are second in the Western Conference, which is topped by the Portland Timbers.
Portland continued its strong start to the season with a 2-1 win at home to Vancouver Whitecaps.
Darlington Nagbe opened the scoring for Timbers with a tremendous goal, skipping past two markers before his 20-yard effort went in off the crossbar in the 18th minute.
Darren Mattocks doubled the home side's lead and the Timbers claimed all three points despite Fredy Montero's goal just before the hour-mark, the forward putting away a rebound after his penalty was saved.
The Montreal Impact produced a stunning comeback to deny the Philadelphia Union their first win as they played out a 3-3 draw.
A first-half brace from Roland Alberg either side of a C.J. Sapong goal had Union in control.
Ignacio Piatti pulled a goal back for Montreal prior to the break before a double from Anthony Jackson-Hamel secured a point for Impact.