A 44-year-old woman has been mauled to death by her family's dog while she was having a seizure, according to authorities.

The victim, Melissa Astacio, was attacked by the pet while suffering the seizure in Somerset, Massachusetts on Friday evening.

Her daughter called 911 for help but police and medics were unable to save her, according to a statement from the Bristol County district attorney’s office.

“When police and paramedics arrived on scene, police were forced to deploy a Taser on the dog before being able to assist the victim, who was then rushed to Rhode Island Hospital,” the statement said.

Astacio was pronounced dead at the hospital around 6.20pm, an hour after the attack occurred.

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The dog, an eight-year-old pit bull, has been taken into the care of Swansea Animal Rescue and quarantined.

Authorities say they do not believe that any foul play was involved, and the 44-year-old woman was known to her friends and family to have had a medical condition that leads to seizures.

The Centres for Disease Control and Prevention estimates there are about 4.7 million dog attacks on people in the US each year, with about 30 to 50 of them fatal.