A 5-week-old baby left alone by his grandmother died after being mauled by the family dog.

Jose Diaz was on a bed Tuesday when the dog jumped up and attacked him. Police believe a 7-year-old mutt hurt the boy, though officers also found two other dogs in the house.

The baby had bites on his face and head when his parents, both 19, brought him to a fire station after the attack. He was taken by helicopter to Shands Jacksonville hospital (search), where he later died.

Sun Woodjinski, 49, was supposed to be baby-sitting the boy. The baby's mother, Jennifer Woodjinski, was working at a nearby Taco Bell (search) and his father, Albert Diaz, did yardwork.

The mutt belonged to Jennifer Woodjinski, but she left the dog at her mother's home when she moved away and had her baby.

Homicide detectives were investigating, but it appeared the death was accidental, Jacksonville Sheriff's Office (search) spokesman Ken Jefferson said. It was unclear what would be done with the dogs.