A baby girl whose death prompted police to seize the family dog was just six days old.
Dyfed Powys Police said the baby - who has not yet been named - died at the University of Wales Hospital in Cardiff this morning, after emergency services were called to a home in Pontyberem, Carmarthenshire, Mid Wales.
Chief Inspector Ieuan Matthews said: "The baby girl was just six days old.
"Clearly, our sympathies are with the family at this tragic time and we have specialist officers who are supporting them. All I would ask is that you give them time and space to grieve.
"As far as our inquiries are concerned, the investigation is still at an early stage."
The baby has been named by police as Eliza Mae Mullane.
The dog seized from the property was an Alaskan malamute, police confirmed. There has been no confirmation of the types of injuries suffered by the baby, or the possible cause.
The chief inspector said: "As you know, we are investigating the sudden death of a baby at a property in New Road, Pontyberem.
"We were called by the Welsh Ambulance NHS Trust just before 8.30am this morning, and the baby was taken by heli-med to the Heath Hospital.
"Sadly, she was later pronounced dead at University of Wales Hospital in Cardiff.
"The family dog - an Alaskan malamute - has been seized by police in connection with the ongoing inquiry. I can confirm that this dog is not listed under the Dangerous Dogs Act."
He added: "It's a real tragic incident and we are at the early stages of investigating.
"Our hearts, as individuals and as a police service, go out to the family, parents and the wider community.
"We have got specially-trained family liaison officers supporting the family through this very difficult time.
"The little girl is six days old, tragically. As you can imagine, the family are hugely distressed.
"These are tragic circumstances and our hearts go out to everyone involved."