FC Dallas (6-1-4, 22 points) scored in the 11th minute when forward Jader Obrian dribbled past a Galaxy defender toward the box and centered to Ferreira, who put in the cross for his eighth goal of the season and third in three consecutive matches.
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Ferreira and a couple of teammates did a choreographed goal celebration dance.
The ninth for Ferreira came just a little later, but before that, FC Dallas took advantage of a Galaxy turnover in their defensive half of the pitch. Paxton Pomykal obtained possession and passed ahead to Paul Arriola, whose left-footed shot got past one of the hottest goalkeepers in MLS, Jonathan Bond, for a 2-0 lead in the 20th minute.
Just before that, a header on goal from the Galaxy's Javier "Chicharito" Hernandez went off the hands of Dallas goalkeeper Jimmy Maurer and hit the post, somehow managing to stay out of the net.
Ferreira made it 3-0 in the 23rd minute, beating Galaxy defender Chase Gasper, still new to the team, to a long ball from Marco Farfan, who'd wrestled the ball from a Galaxy player at the other end. After getting though Gasper and well past Bond, who decided to come far out of his net to contest, Ferreira waited for a moment before tapping the ball in, drawing an angry reaction from Galaxy fans.
The Galaxy (6-4-1, 19 points) got a goal from Douglas Costa in the 67th minute. A free kick went to Costa, and he finished with a one-hopper into the net to make it 3-1.
The Galaxy had allowed only seven goals in 10 games this season before Saturday.
FC Dallas extended its unbeaten streak to nine matches.
Jesus Ferreira, FC Dallas pounce on LA Galaxy for huge 1H
Jesus Ferreira scores twice and Paul Arriola tacks on another to give FC Dallas a 3-0 lead at half.