Your dog may feel sick that's why it does not want to eat.
Add some milk to it and see if he likes that. I have found that works. Puppies do like milk, so you may want to feed them mostly milk and add a little Puppy Chow to it to see if they can get used to the Chow, reducing the milk over time.
Another approach that you may want to try is to add some canned dog food to it, mixing it in really well. Some dog owners also go down the wrong path by having their dogs dictate to them what they will eat. If you have a good quality Puppy Chow, they will eat it if you put it down for a period of 10 minutes and take it away and put it back down for their meal time later.
If they don't want it early in the morning, put it out again later in the morning to see if they have more interest.
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