If you go to "Regulations Governing Animal Control in Macomb County", you will see a set of rules that everyone in the county has to follow. The dogs can be picked up by animal control for running at large/no leash or failure to wear a license tag while off owner's property. There are certain specs for living conditions and food and water too. So maybe if it happens again, you can get animal control involved. If you had this person's phone number (and if it wasn't a cell), have a tried a reverse look-up?
http://www.macombcountymi.gov/Publichealth/animal.htm