Most can be saved with good veterinary care.
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Listen to whatever vetvetdoug tells you. He is an EXCELLENT vet.
;-)
SumProVita has given you good advice...Listen to your Vet. Several years ago I adopted a three month old Rottweiler from a pound. She exhibited the very same symptoms as your little guy. She was at the vets for about 8 days following a diagnosis of Parvo, but survived. She got to be about 100 pounds and lived to be 17.
Vet suggested when I brought her home to start her on warm Cream of Wheat, which I did. Her energy quickly increased. I will tell you one downside, her eyesight suffered a little that the vet said was a result of the Parvo, but it it was never a serious problem. She will always be my favorite dog.
Please give your little guy a chance. These dogs that start out with problems always reward their owners.