| Continue to offer him dog chow, best what the breeder was feeding. If he doesn't eat, try not to let it upset you. Your being upset, will upset the puppy, making things worse.
Lavish attention on him, scratching his ears, rubbing his tummy and butt, etc. Throw balls for him. Take him on walks away from places there are unknown dogs. If he hasn't started eating by Friday, call the vet. You don't want a problem that didn't show up at the first vet visit taking a bad turn over the weekend.
As I say in the sticky, don't tempt him with rich food. It is much too soon for such. Have you checked his body condition following the link in the sticky? Most puppies are too fat when they come from the breeder, and a few days on nibbles won't hurt a thing. | 
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