My favorite and most effective method for finding owners of vacant houses is to talk to the neighbors on either side of the subject property and perhaps the neighbor across the street. (biggerpockets.com)
They'll have knowledge of the breed's particular needs (such as daily grooming), so that they can find owners who'll be able to care for them properly. (icatcare.org)
You might not find the owners right away or the owners could be desperately searching for their pet. (animalbehaviorcollege.com)