Police found the missing Caleb Walker, a 6-year-old boy, who is also autistic, from Dickson, Tennessee after Milo; the child's dog showed them the Caleb's location.
Caleb Walker was reported missing on Saturday after he wandered off from his home while playing outside.
Police said they found the child in a wooded area near the Walker's home.
"We were coming up the hill and we saw the little Jack Russell and we knew he was supposed to be with him. I got out and started looking about 30 yards passed where the little Jack Russell dog was". Sergeant Gill Wood with the Montgomery County K-9 Search and Rescue said.
He added, "We are just glad we found the little guy, with the extreme temperatures tonight we were scared it would turn out tragically."
"Thank you so much everybody, who had anything to do with anything. We just thank you so much," Walker's grandmother told Nashville's News 2.
Walker was taken to a local hospital as a precaution on Saturday, but has since returned home with his family.