Two pit bull terriers fatally attacked their owner who had raised them since birth, authorities said Tuesday.

Tina Marie Canterbury, 42, was walking to her back yard when the 2-year-old redbone pit bull terriers attacked her, according to the Clay County Sheriff's Office.

One of Canterbury's sons tried to help her, but the dogs attacked him. He was not seriously injured, authorities said.

A family friend shot at the dogs to scare them away. A deputy shot one of the dogs. The other dog ran away but was found two hours later and killed, authorities said.

Clay County Sheriff Rick Beseler said he couldn't remember such a severe dog attack since becoming sheriff three years ago.

There were no signs of dog fighting or other abuse at the Canterbury home, authorities said.