Authorities said experts and police are examining a human skull, machetes, animal remains and a "creepy-looking" doll head dug up by a dog last week in the backyard of a rented home in Northern California.
It took three weeks of relentless digging before Skye, a 4-year-old husky, unearthed the remains, prompting roommates at the Yuba City home to call police.
"She never digs in the grass or anything, but that one spot. She just wouldn't leave it alone," renter Aaron Kind told KCRA-TV.
Experts called in from Cal State Chico said the items were possibly used as part of an Afro-Caribbean religious tradition, but officials are still trying to determine the origin and age of the human remains, and how long they've been underground.
Yuba City police said the investigation is continuing and that foul play had not been ruled out in the case.