This is very scary. Everyone here is right. This guy could've been at the pay phone near your house. Who knows? Microchipping is a good idea. My baby got out when we first moved and she had a collar and tags on with our old address. I looked all over the town for her. Then a person stopped and asked me if I was looking for a cat or a dog. I told her a yorkie. She didn't know what that was so I showed her a picture in a magazine I had of a yorkie. She said "Oh, my next door neighbor just got one of those today."I asked her where her neighbor was. She told me and it happened to be a block from my house. I went to their house and inquired about the yorkie. They said it was theirs. I said "well, mine had a purple butterfly collar on with the address and phone #." She said oh, well it's not yours then this one didn't have a collar on. I said o.k. mine is also microchipped. The lady ran in the house and got my dog! Just mentioning your dog is microchipped scares alot of people into not wanting your dog. Good luck.