Our dog does not eat when he is not at home. Even when we use to leave him with my husbands parent, while on vacation. He is 14 we left him at a really nice kennel for the first time ever. She put gravy on his kibble and he ate all of it. Don't know if that might help, until he gets totally adjusted. It takes time, he will eventually eat, I am sure, but you might try the gravy idea.