SIOUX FALLS, S.D. (AP) — A six-week old South Dakota boy was mauled to death by his family’s dog, sheriff’s officials said.

The Sioux Falls Argus Leader reports that the Belgian Malinois attacked the baby Thursday afternoon at a home in Hartford, about 15 miles (24 kilometers) northwest of Sioux Falls.

The Minnehaha County Sheriff’s Office said in a statement that first responders found the boy with several bite wounds. He was flown by helicopter to a hospital where he died of his injuries, the sheriff’s office said.

The Sioux Falls Area Humane Society took custody of the dog.

“It’s a very sad situation,” Sheriff’s Sgt. Zachary Cegelske told KELO-TV. “It’s a very tragic loss for the family and friends.”

Sheriff’s investigators are working on determining what caused the dog to bite.

“Most dogs and cats bite out of fear,” Sioux Falls Animal Control Lead Officer Milo Hartson said. “They’re just scared of their environment, what’s happening.”

Sioux Falls Animal Control officials say they typically see an increase in dog bite calls during the holidays and recommend pet owners keep dogs in a kennel or separate room if people are visiting over the Fourth of July.