A. If he does not start eating (but keeps drinking) in the next 6-8 hours I would strongly suggest to take him to your veterinarian for a check up and appropriate investigations and treatment. A very long list of causes can provoke inappetence.
Try with different type of food and digestible/palatable diet (as chicken and rice). If he shows signs of lethargy, depression, vomiting, diarrhea then definitively take him to your veterinarian even sooner than 8 hours.
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