A newborn baby girl underwent surgery in hospital this morning after the family dog attacked her in her bassinet last night.

Jessica Graham had just finished feeding her seven-day-old baby and turned out the lights at her Campbelltown home when the attack took place.

Her partner Aaron Graham heard their baby crying and found their pet Alaskan Malamute leaning over their baby girl in her bassinet, biting her on the face.

The baby with its grandmother. (9NEWS)

The baby was taken to hospital around 3.30am after paramedics were called to the home. Her facial injuries are significant but not life-threatening.

Earlier, Superintendent Wayne Benson said the baby was in a serious but stable condition and was undergoing surgery.

He said police were sending all their thoughts and prayers for the baby.

"Our thoughts and prayers are with bubs to make sure bubs makes a full recovery," Supt Benson said.

A dog believed to be the Alaskan Malamute responsible. (9NEWS)

Two dogs in the yard of a home where a newborn baby was bitten by an Alaskan Malamute. (9NEWS)

"You can only imagine what that poor family is going through at present."

The baby is the couple's first child.

He said the family's dogs were "loved and cherished members of the family".

The Alaskan Malamute and another dog could be seen through a side gate at the family home this morning.

The baby and her parents are at Sydney Children's Hospital. (9NEWS)