text: Archie Darby died on 13 October after being attacked by a Staffordshire bull terrier-type dog in Harwich Road, Colchester.
  Essex Coroner's Court heard the infant died from severe head injuries consistent with a dog attack.
  His 22-month-old brother Daniel-Jay was left with "life-changing injuries".
  The boys' mother was also hurt.
  Live: Read more about the hearing and other Essex news
  The dog was put down with the consent of its owner - the children's aunt - who has been named in reports as 31-year-old Clare Ferdinand, a serving Essex Police officer.
  Police are not treating the attack as a criminal investigation.
  During a brief hearing, coroner's officer David Dinnell said: "Archie Darby was a four-month-old baby being held in his mother's arms when he was taken out of her arms by the family dog and attacked."
  The inquest heard an ambulance was called and CPR was attempted but Archie was pronounced dead at the scene at 16:02 BST.
  Senior Essex Coroner Caroline Beasley-Murray said: "Please let condolences be expressed to Archie's family at this very dreadful time for them."
  A full hearing will take place in December.
target: A dog that mauled a four-month-old baby to death snatched the boy from his mother's arms, an inquest has heard.