Caring for a Puppy With Parvo?

My puppy is just over 5 months old and tested positive for parvo. He has been getting the medicine the vet has been giving him and then going back to the vet everyday for another bag of IV and vitamin B, plus an extra shot of antibiotics. He takes pills at home, one for vomiting, one to control stomach acid, and another antibiotic. He's been having this done for 4 days now and is still pooping blood. That's all that is coming out; it's like a hose of blood.

He is very skinny. Oh sorry, he is a Saint Bernard. He is still vomiting. My vet says it's OK, but you feel that it's not. Every now and then he will take a little water on his own, but still no interest in food. All he does everyday, all day, is sleep, but he will get up to go outside to the bathroom or if I grab his leash. Please help. Is this the normal healing process?

By Liz