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Thank you for your question. My name is***** I have been a small animal veterinarian for 14 years and I'd like to help with your question.
Lethargy is a very nonspecific symptom and can be caused by things ranging from very serious to not serious at all. Can you tell me a bit more. How old is your puppy? Is he drinking water or eating if you offer him something? Any vomiting/diarrhea or other symptoms that might help me understand what is going on?