If you gave up your dog to another person, did you find out it seemed sad or missed you terribly?

We gave up a beautiful bichon to an older couple ; he kept going over to their house and they kept him overnight once then called me. The dog was crazy about this couple and they were thrilled to get him. But have you given up a dog and found out it acted sad or depressed? Did you then take him/her back or did you find out it became adjusted to it’s new home?