A 3-year-old boy was found wandering along the center yellow line of I-70 near Richfield Wednesday, two hours after disappearing from his back yard.

The boy and his dog, a black Labrador retriever, apparently left the yard and followed the fence along the interstate for almost a mile before crawling through a culvert into a canal alongside the freeway, Richfield police officer Dan Jensen said.Police are not releasing the boy's name. The family lives about two blocks from the interstate, Jensen said.

The boy had crossed the eastbound highway lanes and was walking down the road about three miles from the Richfield interchange when he and the dog were spotted by Holly Trapp of Salina, who was driving west.

Trapp drove into Richfield and called police.

In the meantime, the boy's mother, who had been busy doing yardwork and didn't see her son wander away, had also called police.

"She was pretty upset and had covered a lot of territory in the neighborhood looking for him," Jensen said.

Neither the boy nor the dog was injured. The police department investigation is still open, but Jensen said he didn't expect to find any indication of neglect by the mother.