Neighbours rushed to her aid after the dogs escaped at about 3.20pm but the 85-year-old was subjected to a “sustained attack” and was confirmed dead at the scene shortly afterwards.
West Midlands Police said the post-mortem into Mrs Downer's death will take place on April 14.
While tests are still being undertaken to establish the breeds of dogs, which were tranquilised after the attack and seized by police before being “humanely destroyed”.
A 43-year-old man alleged to be the owner of dogs dangerously out of control was arrested just after the attack but has since been bailed pending further inquiries.
A family tribute issued after Mr Downer's death said they "will miss her dearly".
Flowers were also left outside the great-grandmother's home, while neighbours and politicians expressed their shock.
James Morris, MP for Halesowen and Rowley Regis, said: "Like everyone I am deeply shocked and saddened by this horrific incident. My thoughts and prayers are with the family and friends of Lucille Downer at this incredibly difficult time."