Authorities with the Pennington County Sheriff's Office say additional search crews will assist with the search for Serenity Dennard.
Serenity is a nine-year-old girl who walked away from the Black Hills Children's Home on February 3rd.
She was last seen wearing a long-sleeved grey t-shirt with flowers, blue jeans, and boots. Serenity was not dressed for the cold weather.
Chief Deputy Willie Whelchel says volunteers are bringing specialized search dogs to help find Serenity.
"We have one dog coming in from Colorado, two from Wyoming, two from Iowa, and we'll also have two from here in South Dakota...for a total of seven dogs."
Whelchel says a helicopter will participate Saturday and Sunday. He says a one-mile search radius around the children's home has been expanded throughout the week, and personnel have used GPS tracking in the search effort.
"A lot of our focus this weekend is going to be north of the Children's Home, on South Rockerville Road towards Highway 16, Teepee Gulch Road, Foster Gulch Road, kind of that general area is where we're going to be focusing all of our resources this weekend."
Authorities say the investigation is active. Anyone who has seen Serenity Dennard or has information about this case should call the Pennington County Sheriff's Office in Rapid City.