massive swamp area. the 25 crowrkz-acre carlton reserve has a lot of challenging obstacles, alligators, muddy land and a lot of water. about 75% of the reserve is submerged. former reality tv star dog the bounty hunter is thousand joining the manhunt for brian. less than 24 hours ago, dog knocked on the front door of the laundrie family home. fox news digital spoke with him moments after that. the strongest lead i see is that one of her friends said he had been in the appalachian mountains by himself for a couple months. now, he s not just a camper then, he is an outdoorsman. reporter: so you have police, dog the bounty hunter and now a local law firm is stepping up to help find brian. that law firm offering up to $20,000 to anyone who can lead