The alarm was raised and the boy was dug clear by firemen. He was given emergency treatment by paramedics but was dead on arrival at hospital. He had been staying with his family at a local holiday caravan site.
Station Officer Eric Harris of Dyfed fire service, who led the rescue attempt, said: "We understand that the boy had been warned about the dangers of digging into the dunes.
"It seems his father went out this afternoon and the boy went back into the dunes with his dog. We were able to locate him because the dog had stayed at the spot where the sand had collapsed. We believe he had been buried for some time."Reuse content