Crews were called around 7 p.m. to a home in the 20 block of South Findlay Street.
A 911 caller told a dispatcher that he found a dog on top of the baby, and that she was not breathing and was unconscious.
“She’s not breathing. My baby ain’t breathing,” a man told the dispatcher.
The man, who was wailing and begging for help, said he didn’t know what happened but that “the puppy was just lying on her.”
Raelynn was taken to Dayton Children’s Hospital, where she was pronounced dead.
The Montgomery County Coroner’s Office said the hospital informed them of the baby’s death.
An autopsy will be performed, and the baby’s death is under investigation by the Dayton Police Department.