My dog is not adjusting to a move...need advice PLEASE?

It hasnt been that long, but its been over a week. I have two dogs and while one is 100 percent fine-, the other not so much. Im really concerned. Long story short my parents separated for years and then decided to work things out, in doing so they have built a house. Before moving into the new house my mom, my brother and I were in an apt and now we are living in a house thats over 2,300 sq ft. However i dont think this is the problem i think its my dad. Im really worried because he hasnt ate a full meal since weve been in here and hes always sleeping with me or my mom. He just left my room ( i watched to see what he did) he was going to go into my parents room but he went downstairs, thats not like him he always wants to be with me or mom. He is a great dane and i know he is more sensitive than other breeds, but my concern is getting up there,and i want my dog back- i feel if hes not happy then im not doing my job- any tips?? ive done everything i possibly can. Ive started to add human food into his so he at least eats. my mutt loves my dad...what can i do : /