The woman was injured by the animal at a property on Masefield Road in West Melton, Rotherham, on Friday night and was pronounced dead at the scene despite efforts by paramedics, police said.
South Yorkshire Police said a 42-year-old man was also attacked and taken to hospital for treatment.
Two dogs at the property were taken away by officers.
Neither were of a banned breed, the force said.
Emergency services were called to the home at about 22:15 BST.
The man taken to hospital suffered a potentially life-altering injury to one hand, plus injuries to his other hand, abdomen and face.