Puppy with parvovirus?

3 weeks ago, I took in what was a 5 week old German Shepherd orphan puppy from a friend who did not have the time to take care of him. At his 6 week check up, he got his first set of parvovirus vaccination. 3 days later our older dog(whom was always healthy and has never been sick) tested positive for parvovirus.... show more 3 weeks ago, I took in what was a 5 week old German Shepherd orphan puppy from a friend who did not have the time to take care of him. At his 6 week check up, he got his first set of parvovirus vaccination. 3 days later our older dog(whom was always healthy and has never been sick) tested positive for parvovirus. The puppy we took in seems completely fine. He is eating well, drinking and playing like a normal puppy. He is not vomiting, has normal poops, and had a healthy check up at the vet. Is it possible that the puppy got our older dog infected? We are having him tested tomorrow morning to make sure, but with no symptoms it’s very confusing. Our dog is now in the hospital being treated for parvovirus and our vet said she has been doing well. 
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