My dog ran away

I am just wondering how much else can go wrong this week. Last night my dog ran away. I wish that he would come back home. It's scary because he did this four years ago and was gone for 6-8 weeks. I have called the cops to let them know and the vet. I alerted everybody on facebook. I just feel bad because it is so weird around our house with him gone. Ethan asked why he ran away and when he was coming back. He was a very said little boy this morning. We have had this dog for 7 years and it just doesnt feel the same with him gone.