I have a cat, not a dog, but he had a few adjustment issues. (We had to get a new litterbox, as he HATED the first one, and are about to buy new litter because he hates the litter we got! Ugh!) He also cries constantly, but that's because he's an attention whore..
However, I agree with the previous posters. I've had quite a few dogs - and just moving them 15 miles down the road really messed with them for days! I'd give it a week, and if he's still not closer to himself (not eating, etc) I'd pop over to the vet.
I also recommend pet insurance. I'd never have done it in America, but here it's relatively cheap and covers a lot. (Mine is £8.52/month for my cat through Sainsbury's).