My mini dachshund puppy was diagnosed with Parvovirus a few years ago. She was vomiting, lethargic and had bloody diarreah. I went online and researched and there is a vet who works for a rescue shelter in North Carolina that has been curing cats and dogs with Parvovirus by giving them Tamiflu liquid (baby dosage), with a 100% cure rate.
I contacted him and he emailed me the dosage and instructions for my pup. My local vet reluctantly wrote the script and I had it filled at the drug store. After being on Tamiflu for 24 hours, the vomiting/diarreah stopped and she began eating on her own. She was completely recovered in 3 days. I also gave her PediaLight by syringe to keep her hydrated.
Tamiflu is an antiviral and Parvo is a deadly virus, very much like influenza. Although, Tamiflu is not a natural remedy, it definitely will cure Parvo if it is caught early enough.
I hope this helps someone.