West Midlands Police were alerted after the woman was found in a garden suffering from serious injuries at an address in Rowley Regis on Friday afternoon.
Despite the efforts of emergency services, she was pronounced dead at the scene.
Police said the dogs – who have been seized to establish their breed – did not belong to the woman, but managed to get into her garden before attacking her.
A 43-year-old local man has been detained on suspicion of being the person in charge of a dog dangerously out of control.
He remains in custody for questioning.
The victim sustained dog bite injuries, although a post mortem will take place in due course to establish the cause of death.
A police scene and presence will remain in place in the area as work is carried out to establish the full circumstances of what occurred.