A Rottweiler and a Spanish dalmatian are believed to have attacked Lidia Bider at the squalid property near Vercelli town.
Police said close to 100 dogs were kept at the property, which operated as a private kennel.
Vets had to be called to treat the animals as many were in appalling condition.
The two dogs believed to have killed Bider lived in her bedroom with her.
Bider's 53-year-old daughter and her partner were not at home at the time of the attack. They face charges of mistreating and abandoning a disabled person, causing her death.
The pair called emergency services when they returned to the home to find Bider was attacked by the animals, but by the time police and an ambulance arrived, she was dead.