he abandoned one's family might want to get ride of him a while ago but you know dogs would just find their way home. So they probably figured moving was their chance to get ride of him. Poor fellow might have thought his family would be back and was waiting for them.
He was left in their apartment for 3 days with no food and the lid was down on the toilet. On the third day they back for something, not the dog. I just told them, "Give me the dog!" and they did. I went in the apartment is how I know there was no food dish around and no visible source of water, unless he figured out how to lift the toilet seat with his nose and get his head in. He may have as he is pretty smart. They had him for two years. I never saw him outside their apartment. He was not house trained and did not know how to play. We had him for 6 months before we knew he had a voice.