If you check the sticky at
http://www.askmehelpdesk.com/dogs/in...tml#post251802 you will see I suggest continuing what he was eating if you can identify it and it is a dry chow. Otherwise slowly introduce a new chow so as not to upset his digestion. Puppies typically come too fat, so missing eating a day or 2 won't hurt as long as it is just adjusting. Whether it is eating or not, I would schedule a visit to the vet early next week. Take any medical records you have and let the vet plan a shot schedule to protect him. Once the vet sees him, he can far better determine what to do about the lack of eating than anybody here if it is still a problem.
Usually tempting a dog with rich food is the wrong thing to do. If it is sick, it needs a vet. If it is picky and over fed, rich food will lead to a fat, sickly dog. At the most, you might try softening the dry chow with water. Dry chow is better for dogs. Their teeth and jaws need the exercise of chewing it.