Ya know...I totally forgot! My sister's dog, Daisy, was stolen when she was just a tiny puppy. The idiots thought she was a Pitbull (she was a BOXER...like I said, Idiots). When they realized that (a) she wasn't a pitbull, and (b) she didn't have a mean bone in her body (to train as a guard dog), they just let her go.
She was gone for about two weeks...and those two weeks were he-double-hockeysticks for my family, let me tell you. We'd all fallen head-over-heels for her already, and my sister had only had her for a few months.
Two weeks went by, and they had put posters up all over the place (but not even HALF the places you have), and someone called saying they thought that the puppy was possibly wandering around a Taco Bell nearby.
So, they went there, and low-and-behold...there was little Daisy, trying to find food...dirty and hungry, but otherwise totally okay!!
So, Sweetie...there is hope, believe me. If Seth was indeed stolen, maybe they thought him to be a full-blooded wolfdog breed (the names are escaping me right at the moment), or some such. And, once they realize he's not, maybe they'll let him go, and, like in my sister's case, someone'll see him (as you've got the word out to everyone right now) and give you a call.
I have hope for you and Seth...I'm certain your baby boy will come back to your loving arms. You can't love someone that much, and not see them again...I don't see how all your time and energy trying to find him could come to that end.
You will have my love and prayers until you find him...and beyond, Hun.
Hugs and love,
Rosie*