Borussia Monchengladbach shared the points with its namesakes from Dortmund in a 1-1 game of two halves at the Borussia Park Stadion.
Mario Gotze gave the visitors the lead from the penalty spot in the 11th minute, but a first top-flight goal from Amin Younes earned the Foals a point midway through the second half.
The result leaves defending champion Dortmund 17 points behind runaway leader Bayern Munich in the Bundesliga. The sides meet in an eagerly anticipated German Cup quarterfinal on Wednesday.
All eyes were on Marco Reus on his return to Monchengladbach, the side he left last summer after inspiring them to a berth in the Champions League with 18 goals last season.
The pair combined to carve out the first chance of the game which resulted in a penalty when Marc-Andre ter Stegen felled Gotze after he nudged the ball past him.
The Gladbach goalkeeper was only booked, but he could not get near Gotze's spot kick.
Dortmund continued to dominate proceedings with Gladbach struggling to make it even across the halfway line.
A stern halftime team talk must have been held by Gladbach coach Lucien Favre as the Foals emerged transformed in the second 45 minutes.
Gladbach gained more belief and they even had the best chance to win the game in the last minute when Peniel Mlapa failed to beat Weidenfeller in a one-on-one situation.