If you use the unwashed clothes with your scent weight them down so the wind doesn’t blow them in the wrong direction.put them in the area he was lost. Check often calling his name. Check the surrounding houses out. There are groups that search for dogs.They came to flagstaff and found one. I don’t know how you contact them tho. Call your shelter or veterinarian and inquire. Maybe on line too. I would check your trainer out too. I get a funny feeling about this.