Take a piece of your unlaundered clothing and put it outside; the familiar smell may draw him out if he's hiding.

Have you thought of an animal communicator? I consulted a woman with psychic abilities years ago when Morganna went missing. Although the lady was the friend of a friend and not professional, she was good - if I'd used my imagination instead of taking what she said so literally, I might have found Morganna right off. As it was - I *had* to leave my vacation cabin with her still missing, but when I returned, exactly one month later - Morganna was on the top of the deck steps, waiting for me.

The others have given you good advice as well. Have you thought of setting a Hav-A-Heart trap? (Of course, you may get someone other than your intended, but it could be worth a try.)

Best of luck; the not-knowing is so traumatic. Prayers coming for Dean's safe return - and quickly.