Hello I am Dr. Joey. Thanks for trusting me to help you and your pet today. I am a licensed veterinarian with over 15 years of experience. I look forward to working with you.
This sounds most concerning for Eddie. Did his veterinarian do some lab testing when you took him for his visit. If this had been my patient I would have recommended a CBC, Chemistry profile with electrolytes, urine check and stool evaluation.
If not lab testing was done, then this is the next step for him. I am quite concerned that he may become critically dehydrated given that he is so small and now quite lethargic. This would, for me, be an indication to have him seen on emergency today.
It does not sound like you have done anything incorrect at home. If he ate, then he was ready It may be that whatever the cause of this diarrhea and lethargy is not going to be easily treated with the medication prescribed.
I can make some at-home treatment suggestions but my worry is that now he is vomiting and anything you try to give by mouth will not stay down. This usually requires a vet administer an injection for vomiting, or if he is profoundly dehydrated then may need to be admitted for intravenous fluid therapy.
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