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Hello I am Dr. RB:) Parvoviral enteritis is a the top of the rule out list. I am not sure what Paxxin is but if she does have Parvo, the only treatment option for her is hospitalized care with aggressive intravenous fluid therapy, antibiotics and medication to cease vomiting. Parvo can only be diagnosed by your veterinarian and she isn't eating and her energy level is low, she needs to be seen right away. Other test that may be performed include a fecal flotation and/or smear to rule out intestinal parasites, and abdominal x-rays and blood work. I hope this helps you and you can get your puppy in to see her regular vet right away.
I believe the "chunks of meat" you are referring to sounds like inflamed lining of bowel which happen with both bacterial and viral (like Parvo) enteritis. Regardless of the underlying cause of this substance that she is vomiting, it is extremely concerning and she need to veterinary hospitalized care right away.
Hello, just checking to see how your puppy is doing and if my advice helped you? If so, I would greatly appreciate a positive rating. If you have other questions or I can help you further with this please let me know?