The Hawaiian Humane Society notified police about a 36-year-old Haleiwa woman accused of using a dangerous instrument to discipline her pet.
Police say the dog died.
The suspect then reported the incident to police after realizing the severity of the situation.
Andrea Fiegle was arrested on Sunday at a home on Paalaa Road at around 6 p.m. for cruelty to animals in the first degree.
The Hawaiian Humane Society says when they arrived, her dog Star was already dead. Humane Society officials say Fiegle attacked Star with a common kitchen item, but she told police she didn't realize the injuries were so severe.
"We're sorry this dog suffered such mortal injuries that there was nothing else we could do for him," said Jacque LeBlanc of the Hawaiian Humane Society.
Neighbors were shocked by the news. They say they didn't hear a commotion or anything out of the ordinary Sunday evening. They say Fiegle seemed pleasant and friendly and seemed to care for her dog.