I know how you feel We found a black lab mix... beautiful dog. We took him to the dog pound where his owners could come to get him... But after 10 days the dog goes up for adoption. When no one came for him we adopted him. For months i waited to have some one call or pound on my door looking for him back but they never did. (We live in a very small town) I wouldl say he is yours... with draw the adds and keep him... You have done all you can.