So far I've chased down one neighbor's beagle (aptly named Wiggles), another neighbor's two pugs (several times). Today I was looking out the kitchen window and saw a border collie walk across my driveway. No one around here has a BC. I grabbed the little slipleash we keep on the door and spent about twenty minutes playing keep-away with the BC in my backyard, the woods behind the house, and a few houses in either direction. The BC didn't have a collar. I tried baby-talking and got nowhere, and then said "come!" and she started trotting towards me. That worked until she saw a squirrel and it was back to start.
When she got close enough I popped on the slipleash and we went for a walk. I figured if she belonged somewhere, she'd show me. And she did. The people four houses down have a cleaning lady, and she had parked in the driveway with her BC in the car. She rolled the windows down so far that the BC escaped. No idea how long she'd been running around the area. At least the owner was horrified.
The owner said she had rescued the BC from a home where the ex-husband kept the wife's dog, and penned the BC in a too-small crate for nearly a year. The dog has joint problems and behavior problems because of it. She said she's taking the BC to classes in the spring so I recommended my training club. The dog was super-friendly, minds her owner completely, so fingers-crossed I'll never see her running free again.