Two days ago I believe

Tips to find a lost dog
Pray
Barbecue meat where you think he may be and leave the owner's worn clothes.
Leave traps with food and check frequently.
Employ the use of tracking dogs.
Contact area vet offices and animal control.
Use posters with a photo of the dog.
Have your dog also wear a name tag with your phone number when outside
Microchip your dog. If he is chipped call the chip company
Employ the use of game cameras
Offer a reward