OMG Tink, i am so so so very sorry to read this
My heart goes out to you, i know how much he means to you.
Maybe you can put up flyers everywhere, leave some at your vet, and at the local rescue. Also at the schools, kids like dogs, maybe someone found him, and took him home. There are still honest people out there, Tink. Dont give up!!
You, are in my prayers, and please keep us posted!