I'm sorry to hear your pup is sick but bchgirl is correct it is extremely contagious. I'd try to contact your breeder because there is a really good chance your second pup will come down with it. Also be very careful when you go to the vet make sure you disinfect your shoes before you leave the area your puppy is in and wash your hands very well. I would also avoid contact with other people's dogs. I'm sorry this has happened to you. Parvo is really an awful thing