Elon Jase Ellis-Joynes was 12 days old when his family’s Chow Chow-cross is believed to have bitten him on September 13, 2020.
The child, from Doncaster, South Yorkshire, was still alive when mum Abigail Ellis frantically called for an ambulance, but died at the hospital.
Doncaster Coroner’s Court heard Elon was “bleeding from his leg or his stomach”.
Police are currently investigating his death and senior coroner Nicola Mundy adjourned the inquest until a later date.
Coroner’s officer David Copley said: “At 3.04pm on Sunday, September 13, a call was made to South Yorkshire Ambulance by Abigail Ellis.
“She stated that her son, Elon, was breathing, but was really poorly.
“He was bleeding from his leg or his tummy, she thought that one of the dogs had bitten Elon.
“She had been on the toilet and her partner Stephen was outside with another child and came running in.
“Officers attended and Stephen Joynes identified Elon to police officers.”
A police spokesperson said the baby had suffered serious injuries after being attacked by a dog.
They said the pet, called Teddy, was removed from the address and will remain in secure kennels until the force’s inquiries have been completed.
