A schoolboy died from "severe injuries to the head and neck" after being attacked by a dog, an inquest has heard.
Jack William Lis, 10, was killed by the dog after calling into a friend's house after school.
A coroner heard his injuries were "unsurvivable" with a pathologist giving the provisional cause of Jack's death as severe head and neck wounds.
The inquest in Newport heard Jack was outside his house in Penyrheol, Caerphilly, where he had been "playing with a friend".
The two then went to his friend's home in a neighbouring street after classes on Monday when the dog attack happened.
Caroline Saunders, senior coroner for Gwent, said: "Upon entering the home Jack was attacked by a dog".
The court heard paramedics were called but Jack's injuries were "unsurvivable" and he was pronounced dead just after 4pm.
Jack was identified by family photos provided to the mortuary manager at the Royal Gwent Hospital
Miss Saunders said the circumstances surrounding Jack's death were "violent and unnatural" and so formally opened an inquest into his death.
The inquest heard a 28-year-old woman has been arrested over the death
The coroner then adjourned the inquest for "further inquiries" to be made and it will be resumed at a later date.
The dog had only been with his friend's family for days after being sold by roofer Lee Jenkins.
Jenkins advertised as being "grate with people."
The ad described it as height 24ttw - about the same as a Labrador - and weighing 115lbs.
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The brown and white dog was shot seven times by armed officers after it launched the attack on schoolboy Jack.
Neighbours described the animal as having "huge muscles" protruding from its shoulders as they saw it moments after Jack's death.
Police say a dog legislation expert has now been brought in to examine its features to see if it is a breed allowed in the UK.
Chief Superintendent Mark Hobrough said experts will "look at the character traits of the dog" to see if it is a banned breed.
He said: "We are looking at all potential offences and all potential actions that need to come as a result of this investigation."
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