We are missing our live stock guardian dog

We are missing our live stock guardian dog. He is light brindle weighs 100lbs is wearing a bright yellow collar with our info. Was last seen in our front yard in Dale IL on Sunday night. We have had a drone look for him the following day and have searched ourselves all week with no luck. We are afraid he could have been picked up by someone just traveling through our area. We want to find Forrest and bring him home. If anyone sees him anywhere or hears anything about it please let us know