He refuses to eat his meals

I am currently feeding my 3 mths old puppy with the dry dog food that is recomended by the breeder. But after a month, my puppy refuses to eat it any more. I do give him small treats when he is good but has been very careful not to feed him too much or too close to his meal time. is there something else that I should do? When should I change his food?

Is there any other reasons why he is not eating? He is still as playful and active as before. Please advise me as I am worried sick about him not eating. The vet thinks that there is nothing wrong with him.

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