We had the same problem with our dog several years ago . My son brought home a puppy , 2 yrs later he moves out and leaves the dog here with us . Well he wouldn't eat . I tried to hand feed him , nope would take it ! Had to call my son to come over and see him . This went on for about 2 months , I think Buster just missed him . Your dog is precious ! Have the previous owners come to visit ? I think sometimes this is a little depressing on dogs . They are used to seeing the "other family " then they are there anymore . Just a little TLC and it should get better . Good luck Annie