On the play, Dunfield streaked through the box and collected an accurate cross from Darren O'Dea. The midfielder was alone and struck a sharp header at Dynamo goalkeeper Tally Hall, who couldn't keep it out of the net.
Toronto, virtually eliminated from the playoffs, used the draw to improve to 5-15-6.
Will Bruin got the only goal for the Dynamo (11-6-9), who extended their home unbeaten streak to 21 regular season matches.
Swim Week Miami Beach 2014 [PHOTOS]