A Brooklyn cop accidentally shot his own sergeant in the foot Tuesday night as the pair responded to a dangerous pit bull in an East Flatbush apartment.

The cop was trying to stop the dog at 9720 Kings Highway at 10:40 p.m. when his gun discharged into his superior officer’s right foot.

The sergeant, 36, was taken to Kings County Hospital and was in stable condition early Wednesday.

The shooting was under investigation, authorities said.