Pet finder for Alger Park - Ash Creek N.A. in Dallas, Texas
White schnauzers are fairly uncommon. I remember one named "Lois" that lived on...Alta Vista?... a couple of years ago. Not sure if Lois and her owner are still there.
Have you found their owners yet? I could knock on the door of the house and follow up in person to see if they're missing their schnauzer. Let me know.