Many years back I lost an Afghan hound puppy--I had bred my female and this was the puppy I was keeping. He got out of my parents' yard. I put an ad in the paper and looked nightly for an ad saying that someone might have found him.
A year and a half later, a man called me and said he thought he might have my dog. We agreed to meet and sure enough, there was my puppy all grown up. The man had found him early on and explained that he had put ads in the paper. But I had not been looking in THAT paper.
So be sure to look in weeklies in other local towns and neighborhoods--even neighborhood newsletters. Weeklies are probably online, which would make it easier. But you can find them at 7-day stores.
And I, too, strongly encourage you to offer a reward in your ad and say that he needs medication.
If someone took him, they
may have done so to make money.
On the other hand, has anyone shown a interest in him lately? Kids? Has anyone visited your house recently who has subsequently left town? I once had a roommate who gave my dog to a guy in a rock band who played at a local club and they left town with my dog in their van. He said he had always wanted an Afghan hound but couldn't afford one. I just had a hunch and I located them a couple of states away and got my dog back. (Ironically, a short while later this group made the BIG time, and he could have afforded any number of these dogs he wanted.)
People who steal a Yorkie for a pet probably can't afford to buy one. So put up ads in places like laundromats. Don't forget grocery stores and
any other place that has a lost and found or community bulletin board. Do you know anyone who works for a large employer? Any college kids? They have active bulletin boards. Leave flyers everywhere you go. You just never know.
Also, you might try asking a National yorkie rescue group; they have a national network:
www.yorkierescue.com/
Linda