Where do you live? That sounds horrible!
A few weeks ago I was stopped at a stop sign and I saw a dog "run" the stop sign (hee hee) and pass right by me - on the street, running from right to left. It was the oddest thing I've ever seen. The rest of the traffic had stopped as well. About 15 seconds later animal control followed closely behind to pick the dog up. He had tags on so I'm hopeful he was returned to his owner.
Other than that, I haven't seen stray dogs at all. Just this past weekend I took my dog to See Spot Walk, an event held at Julia Davis Park to benefit the Humane Society. After that we drove a short distance to Grove Plaza and went to World Fest and the farmer's market there. It was a great weekend for the entire family but the dog appreciated it the most!
You may also want to post your question on the newly formed social network from Charley Pet Boutique.
Charley The Pet Boutique News (2nd blurb down will give you the link.) They are a great store downtown that is active in the community.