Thanks everyone for the responses. I love her very much and we have fun together. That still doesn't mean I've stopped my quest for her owner.
What sucks is, the man who got on the bus said that a sheriff was right there to witness (there was almost an accident to keep from hitting the dog) a woman flagging him down, but he kept on driving, I guess
I remember where I was on the bus when I found the dog. Sad to say, it didn't seem like the best area (I just moved her) for such a polished yorkie to be wandering lol..but I digress, I'll look into putting up posters anyway!

I have not called the local police. I have called the shelters and placed a report along with my cell number in case the owner calls looking.
I'm going to look into placing a newspaper ad too! It never even occured to me that the owner was older and didn't have internet access. But, I'd hope she'd have at least called the shelters..but no.
I'm in Dayton. I dont' even remember seeing many homes out along the route I was on the bus. Doesn't hurt to take a second look though.