Police say Christine Harvey walked away from her home around 4:30 p.m. Friday and her parents called police around 9 p.m. that day to report she never came home near the 6200 block of Wolff street in Arvada.

"We encourage our kids to cool down before they enter into engagements with one another and with other people," said Bill Harvey, Christine's father. "She'll walk around and cool down, generally she'll walk out into the park, she'll be gone maybe 30 minutes or an hour, she'll come back home and we can talk about maybe what it is that's bothering her and we work through that ok."

Harvey couldn't say why Christine may have been upset about Friday. She and her mother were talking about her art.

Christine's parents say they're worried about her because she has the mentality of a 12 or a 13-year-old girl.

"Our daughter is very sweet and she's very kind and she likes people," said Jerilyn Harvey, Christine's mom. "We just want her back. We just want her back home. I don't know where to begin. I don't know where else to go."

Police believe the teen walked away and could still be on foot.

Harvey was last seen wearing black pants and either a pink or blue shirt. Arvada Police say she is a white female between 5 feet 2 inches and 5 feet 4 inches tall, has long blonde hair, blue eyes and weighs between 130 and 140 pounds.

"If somebody were to approach her or she could approach somebody and say that she was lost, she would know where her address is and how to contact phone numbers," said Sgt. Michelle Moriarty with Arvada Police. "She's kind of very shy and quiet, that worries us a little bit she might not contact somebody for that."

Police ask anyone who has seen Harvey to call the Arvada Police Department at 720-898-6900.

The Jefferson County Sheriff's Office brought in bloodhound Georgia to help with the search.

Georgia, is 7-years-old and has helped in a number of high profile cases, including the search for Kenia Monge, the Aurora teen killed by Travis Forbes, and in the case against Scott Kimble, where Georgia helped search for bodies.