Dortmund had opened their campaign in style last week but the defeat is a blow to their hopes of defending the title.
Bayern scored a late winner to beat Wolfsburg after losing at home to Borussia Moenchengladbach last weekend.
Dortmund had opened their campaign in style last week but the defeat is a blow to their hopes of defending the title.
Bayern scored a late winner to beat Wolfsburg after losing at home to Borussia Moenchengladbach last weekend.
