I couldn't find my barn cat for a week. I called local shelters, wandered around calling for him, searched the barn high and low, and finally came to accept he was gone. He would always come when I would call. Then I got a call from animal control, I was so happy until they told me the cat was orange (mine is a black and white tuxedo). I went to the barn to see my horses (they are a good source of comfort) and I found him asleep in one of the horse feeders. That was two years ago, and I've never had him go missing again. Don't give up hope.