My dog is still missing after 3 months!

Otis, a medium size, mostly white, neutered male mixed poodle/terrier (looks like a Goldendoodle) disappeared from my yard wearing a collar with tags and a leash on 9/22/2013. He has a HomeAgain microchip that has migrated to somewhere in his body from the original insertion site. I have posted him online everywhere, including Facebook. Craigslist and many other sites. Every poster I put up in my neighborhood, in nearby places, and on the Cross County Trail has been removed by somebody. I really believe that Otis was stolen and that there may be a dog thief living in my neighborhood, Camelot. Can someone please help me find my dog? Thank you.