Other things you can try are to call your local and state police department, and hit every animal shelter you can find in a fifty mile radius from your home. Also contact the local animal control officers and game wardens in your area. Is your dog micro chipped, it is very helpful when trying to locate a lost animal, I have all of mine done even the cats that do not go outside.
People are great for picking up and animal that they think has been abandoned and take them home with them, later decide they don’t want them and take them to the nearest animal shelter, mean while the animal is so far from home that putting up poster in the area lost does no good because the animal is 5 or 6 towns over.
This site that I have listed below is called Pet ark, it allows you to search, the first option they give you is scope, this allows you to pick from found, adoptable or stray. It is a good site that we use to list our piggies
http://www.pet-ark.com/pets.pl?j=sP&lS=Dog&g=
The next one listed below is Pet911; you will find the same options on this site. We also list our piggies here which is also a good site.
http://www.pets911.com/services/lost...70d9a22242a97d
Good luck, Donna