Please check for a chip. Any vet or petco should be able to do this for free
Check/post on next door app.
Check post on pawboost, lost & found pets of Cypress. I know you posted on the fb page, just checking if you looked through them to see if anyone has posted already looking for them.
If possible can you put up posters and/or knock on doors near where they were found for people not on social media.
You can also check area vets to see if they know the dog, anyone has come looking for it, or if you can put up a flyer there.
Thank you for keeping them safe and trying to find the owner!