The pair were discovered at their flat in the capital of Lower Saxony, Hanover, on Tuesday evening after a relative saw the bloodied body of one of the victims through a window and rang the emergency services.
Firefighters were called in to capture their dog, which was still inside the residence, Hanover police say in a statement.
Fire personnel broke down the door and caught the dog by using a sling.
“Initial examinations by a coroner suggest the 52-year-old woman and her 27-year-old son were killed by the dog,” the police say.
